FAQ & Troubleshooting

Why am I getting air out of the nozzle, but not fluid/spray solution?
The siphon tube might be clogged, missing, or loose. First, make sure to remove all pressure from the tank. Then, disconnect the hose from the tanks by unscrewing the compression nut (poly tanks only) and removing the hose from the tank nipple with a simultaneous twisting/pulling motion. Check to see if the siphon tube (supply tube) is firmly attached to the hose insert. If not, reinsert. If the tube is clogged, try to unclog. If the tube is missing or you cannot unclog the siphon tube, contact Customer Service at (800) 253-4642 for a replacement.

I pump the sprayer, but it will not pressurize/hold pressure. Why?
Follow the instructions in your Owner’s Manual to disassemble the pump assembly. Check the plunger cup or plunger cup o-ring for cracks or splits. If it is not damaged, lubricate it with mineral oil, olive oil, or petroleum jelly (petroleum jelly is best) and reassemble the pump assembly. For replacement items, purchase the 1916H kit. To purchase the kit, check with Customer Service to (1) verify the 1916H kit is indeed the kit you need and (2) determine which retailer’s carry the kit.

How do I disassemble my flow control (shut off) assembly if it is plugged?
Never attempt to repair your sprayer while it is under pressure. To release pressure, follow these steps. Once you have safely released all pressure, follow below instructions.

Where is the o-ring that the “Owner’s Manual” says must be lubricated?
The o-ring is on the white insert that is on the end of the hose, which you inserted into the tank nipple.

Can I use diesel fuel or gasoline in my sprayer?
Absolutely not. Never use flammable, caustic, corrosive, heated, or self-heating liquids in your sprayer. Also, unless your product is a bleach sprayer, do not use chlorines or bleach.

Can I spray paint or solid stains with my sprayer?
No. To spray such thick, viscous fluids, you’ll need an airless sprayer. Be sure to read the instructions provided by the manufacturer for the best means to apply their product.

How much chemical should I put in my sprayer?
That question can be answered ONLY by you and the chemical manufacturer. Please read their label instructions or check their websites. NEVER FILL ABOVE “MAX FILL LINE” ON TANK.

How much pressure does my sprayer hold?
The pressure you achieve by pumping varies depending upon (1) the model of the sprayer, (2) how much liquid is in the sprayer, and (3) how strong you are. As a rule of thumb, pump the sprayer only until you feel a strong resistance.

How do I release pressure from my sprayer?
If your sprayer is equipped with a pressure relief valve, you have two options, depending on the sprayer model you own: (1) point the pressure relief valve away from you and pull up on the red or yellow nipple and hold open until you can no longer hear the air escape or (2) point the pressure relief valve away from you and turn the yellow knob clockwise until you can no longer hear the air escape. If your sprayer is not equipped with a pressure relief valve, tip the sprayer upside down and depress the flow control (shut-off) until no more liquid or air escapes from the nozzle.

What is your warranty?
You will find the length of your limited warranty on the original carton or in the “Owner’s Manual” included with your sprayer.

How do I clean my deck/wood/masonry sprayer?
Each chemical manufacturer has specific recommended guidelines for cleaning up after using their product. If the manufacturer recommends cleaning with Mineral Spirits, then you must remove the Mineral spirit residue from the sprayer/hose/flow control/wand/nozzle by thoroughly rinsing with warm water and dish soap, followed by a thorough clear water rinse. In any case, be sure to dispose of any chemical and/or chemical residue safely and responsibly.

Use & Care Guidelines

To ensure proper use of your sprayer, please follow these guidelines:

ALWAYS water test sprayer before each use.

ALWAYS wear long sleeve shirts, long pants, goggles, gloves, and durable shoes when dealing with chemicals.

ALWAYS READ AND FOLLOW label instructions for the chemical to be applied.

AFTER USE, release pressure and clean the sprayer.

ALWAYS RELEASE pressure in sprayer before servicing.

DO NOT alter the sprayer or its components.

DO NOT spray flammable, caustic (acids, chlorines and bleach), corrosive, heated, or self-heating solutions with this sprayer.

DO NOT store liquids in the sprayer.

DO NOT use vinegar or salt in the sprayer.

NEVER fill above the tank’s “MAX FILL LINE.”

Help protect the environment. Please use chemicals carefully, according to the directions specified by the chemical manufacturer, and dispose of them properly.

Owner's Manuals

Digital owner’s manuals provided below include detailed operating instructions, service instructions, and assembly illustrations.   For owner’s manuals not listed, please call Customer Service at (800) 253-4642 or email at service@rlflomaster.com.

Anatomy of a Sprayer

How it works.

1) Unscrew the combination carrying/pump handle from the top of the tank by twisting the handle in a counter-clockwise direction.

2) Pour in a measured amount of the chemical you plan to use, then add the appropriate amount of water to dilute the mixture according to the chemical manufacturer’s instructions.

3) Screw the handle/pump assembly back into the top of the sprayer in a clockwise direction, ensuring a snug fit.

4) Turn the pump handle enough so that it unseats from its stops and then pump the handle up and down to pressurize the tank. Approximately 20–30 strokes are normally sufficient to provide good spraying pressure.

5) Reseat the pump handle and you’re ready to spray!

In the spraying process, depress the handle on the flow control to release spray. Pressure in the sprayer forces the diluted mixture up the siphon tube, through the hose and flow control, and out of the adjustable nozzle.



Design features.

Originally steel, most modern sprayers now have a tank of high-density, polyethylene. This material is tough, non-corrosive, lightweight, and usually translucent, so you can readily see the level of fluid you’re adding to the sprayer.

Flow-Control (Shut-Off)
Most RL Flo-Master® sprayers feature a corrosion-resistant poly flow control, which has an ergonomically designed handle and grip and a lock-on feature for extended spraying. Certain models will have a heavy-duty brass flow control, also with a lock-on feature.

Sprayer Top
Higher-end sprayers typically have a funnel top for ease of filling and pouring out leftover fluid; lower-cost sprayers have a straight neck.

Adjustable Spray Nozzle
Sprays a cone-shaped pattern, adjustable from a fine mist to a solid stream for reaching high into trees or large bushes.

Pressure Relief Valve
Releases excess tank pressure if over-pumped; also useful to release pressure when you’re done spraying. Found only on certain models.

Carrying Strap
Typically found on three-gallon capacity sprayers and on premium two-gallon models.

Carrying/Pump Handle
Features a “Comfort Grip” for ease of use and carrying, plus wand storage slots to hold the extension wand/hose assembly in place while in storage.

The pump and integrated handle create air pressure inside the tank, which forces fluid out through the siphon tube and to the flow control.

Reinforced Hose
Heavy-duty, reinforced hose for long life. Screw-on tank connector simplifies assembly and maintenance of sprayer.

Tank Sprayer Benefits

Why is a tank sprayer best for applying chemicals?




Less Effort

The sprayer requires much less effort. Once you’ve pressurized the sprayer, you can spray the entire contents with its ergonomically designed flow control. Ready-to-use (RTU) pre-mixed chemical containers have a spray and pump mechanism that requires you to repeatedly squeeze the pump trigger with your hand, which becomes very tiring.






Saves Money

Buying ready-to-use chemicals wastes money. For example, using the sprayer with 32oz. of a broadleaf weed killer concentrate, costing about $12 makes the same amount of liquid spray as 32 gallons of ready-to-use spray, which could cost about $640.





Better Performance

The sprayer has an adjustable nozzle capable of spraying a fine mist or a solid stream. It provides accurate delivery and better coverage. You can spray the ground without bending over and easily reach between plants.


Looking to register your product?

Root-Lowell Manufacturing Co. warrants to the original purchaser only that the product purchased will continue to function as intended if used in accordance with operating instructions (under NORMAL CONSUMER USE) for the time specified as noted on the product carton. If you no longer have the carton, please contact Customer Service at (800) 253-4642 (hours of operation noted below) and they will determine the length of the warranty.  If the product fails to function as intended—DO NOT RETURN IT TO THE STORE—call us for fast service. We will, at our option, repair or replace any non-functioning parts without charge (shipping and handling charges will apply). Root-Lowell Manufacturing Co. shall have the option of requiring the return of the non-functioning product, to the address listed below, together with the proof of purchase to establish a claim under this warranty. This warranty does not apply to damage resulting from accident, misuse, neglect, alterations, operation not in accordance with instructions, commercial use, or normal wear of o-rings, seals or gaskets.


Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so these limitations or exclusions may not apply to you. This warranty gives you specific legal rights and you may have other rights, which vary from state to state.


Hours of operation:
All Year: Monday–Friday: 8:00am to 7:00 pm, EST.
March 1–August 31: Monday–Friday, 8:00am to 7:00 pm, EST. Saturday and Sunday: 10:00am to 4:00pm, EST.

Or write us at:
Root-Lowell Manufacturing Co.
1000 Foreman Rd.
Lowell, MI  49331-1074

Help protect the environment. Please use chemicals carefully and responsibly, according to chemical manufacturer’s guidelines, and always dispose of them properly.


What we’re doing.

We dispose of all manufacturing and office products correctly, recycling whenever we can.

We specify recycled (or recyclable) paper products, soy-based inks, and water-based varnishes for all packaging materials and printed matter.

90% of our consumer products are packaged in 100% recyclable cartons and meets SFI requirements.

By our reclaiming materials during our manufacturing process, we generate 0% waste.

What you can do.

Assume all chemicals appropriate for your sprayer are “hazardous” and treat them accordingly.

Carefully follow the chemical manufacturer’s directions for handling, use, dilution, clean up and disposal.

Do not spray in windy conditions, which would allow the chemical spray to drift.

Do not overuse chemicals or apply more than needed.

Dispose of any remaining chemical solutions correctly (follow manufacturer’s directions).

Use chemicals carefully and consider their impact on your local wildlife.

Customer Service Contact

Contact: (800) 253-4642.

Through Customer Service, you have immediate access to our expert knowledge and support for as long as you own your RL Flo-Master® sprayer. Our representatives can respond to any questions you may have regarding maintenance, operation, and repairs of your sprayer. You can also purchase replacement parts.

Representatives are available all year, Monday–Friday: 8:00am to 7:00 pm, EST, and Saturday and Sunday, 10:00am to 4:00pm, EST, between March 1 and August 31.  Call us toll-free at (800) 253-4642 or email us at service@rlflomaster.com.  We’re here to help.

If you recently bought your sprayer and have any questions, or seem to be missing parts, please do not return your sprayer to the store. Instead, give us a call and a representative will assist you quickly and efficiently. Before you call, please have your model number ready.

Privacy Policy

Your privacy is very important to RL Flo-Master. We also understand that privacy is very important to you. This Privacy Policy (“Privacy Policy”) tells you how we protect and use any information we gather through this website located at www.rlflomaster.com. This website is operated by Root-Lowell Manufacturing Co.
Root-Lowell Manufacturing reserves the right to change this Privacy Policy at any time and for any reason. We encourage you to look at this Privacy Policy each time you visit the site and especially before you provide any personally identifiable information.
By using this site, you agree to the terms of this Privacy Policy. Except as written in any other disclaimers, policies, terms of use or other notices on this site, this Privacy Policy is the complete agreement between you and Root-Lowell Manufacturing with respect to your use of this site. You may be subject to additional terms that may apply when you access particular services or materials on certain areas of this site or by following links that take you away from this site.
The information we receive, and how we use it, depends on what you do when visiting our site. We collect and use your non-personal information (information that is not identifiable to you personally) differently than your personal information.
Each time you visit this site to read or download information; we may collect certain information about you from your computer. We do track information provided to us by your browser, including the website you came from (known as the referring URL), the type of browser you use, the time and date of access, and other information that does not personally identify you.
If you only read or download information on our site, we do not collect or learn your name, e-mail address, home address or other personal information about you. We may place a text file called a cookie in the browser files of your computer when you visit. The cookie may be stored on your computer’s hard drive. The information that we collect using cookies is non-personal information. You are always free to decline our cookies if your browser permits, but some parts of our site may not work properly for you if you do so. We will not allow third parties to place cookies on our site.
Our cookies will not allow us to obtain information of a personal nature that will identify you to us, such as your name and address. We will only be aware of such information if you provide the information to us, or you have set the preferences in your browser to provide this information automatically.
Your web browser may allow some control of most cookies through your browser settings. To find out more about cookies, including how to see what cookies have been set on your computer and how to manage and delete them, visit www.allaboutcookies.org. Please note that you may delete and block all cookies used by this website but, if you do so, parts of the site may not work.
There are no restrictions to the way Root-Lowell Manufacturing can use or share non-personal information. We will use non-personal information to help us make our site more useful to visitors and for other business purposes. We may prepare reports and other materials using non-personal information. Since these reports and materials contain no personal information, we may share them with others.
All information that is not personal to you or someone else, such as questions, comments and ideas, shall be expressly non-confidential, and Root-Lowell Manufacturing shall be free to disclose and use these for any purpose without any obligation to you. By choosing to send a message to Root-Lowell Manufacturing, you do so with the understanding that it is non-confidential. Root-Lowell Manufacturing shall have no obligations of any kind with respect to such feedback, and shall be free to reproduce, use, disclose, exhibit, display, transform, commercialize, create derivative works and distribute the feedback to others without limitation. Further, Root-Lowell Manufacturing shall be free to use any ideas, inventions, concepts, know-how or techniques contained in such feedback for any purpose whatsoever, including, but not limited to, developing, manufacturing and marketing products incorporating such feedback.
In some places on this site you may have the chance to send us information about yourself. Root-Lowell Manufacturing may use the personal information we collect to respond to your requests; contact you, via e-mail, regular mail, telephone or otherwise; provide you with information that we believe may be of interest to you; develop records, including records of your personal information; develop and improve programs, products, services and content; enforce this Privacy Policy and our Terms of Use and other rules about your use of this site or for any lawful use.
By submitting personal information (such as your name, address, e-mail address or telephone number), you agree that we may keep a record of it and may use it in accordance with the above. We also may use your personal information to help us in our business, including, but not limited to, improving our site, marketing and/or product development.
Root-Lowell Manufacturing may transfer your personal information to the subsidiaries, divisions or other entities under common ownership with Root-Lowell Manufacturing. You also agree that Root-Lowell Manufacturing may share your personal information with others who help us with these activities. These companies and/or individuals may not use or share your personal information with others except for the purpose of assisting us with our business activities pursuant to our request. Root-Lowell Manufacturing will not sell, exchange or publish your personal information without your permission, except in conjunction with a corporate sale, merger, dissolution, acquisition, or other similar event.
You agree that we may use your personal information to mail or e-mail information to you about Root-Lowell Manufacturing and our products.
Except as otherwise written in this Privacy Policy, we will keep your personal information private and will not share it with others, unless the disclosure is necessary to comply with a law or regulation, court order, subpoena or other legal process, protect our rights or property, enforce our Terms of Use or this Privacy Policy or protect someone’s health or safety.
In addition, you are prohibited from posting or transmitting any unlawful, threatening, libelous, defamatory, obscene, scandalous, inflammatory, pornographic or profane material or any material that could constitute or encourage conduct that would be considered a criminal offense, give rise to civil liability, or otherwise violate any law. We will fully cooperate with any law enforcement authorities or court order requesting or directing us to disclose the identity of anyone posting any such information or materials.
This site may contain links to other Web sites. We provide these links for your convenience, but we do not review, control or monitor the privacy practices of Web sites operated by others. Root-Lowell Manufacturing is not responsible for the performance of these sites or for your business dealings with them. Your use of any other Web sites is subject to the terms and conditions of those sites, including the privacy policies of those sites.
We care about protecting the online privacy of children. We will not intentionally collect any personal information (such as a child’s name or e-mail address) from children under the age of 13. If you think that we have collected personal information from a child under the age of 13, please contact us.
If you have additional questions, please contact us at any time. Or write to us at:
Root-Lowell Manufacturing Co.
1000 Foreman Rd, Lowell, Michigan 49331-1074