Made for the most discerning homeowners, our sprayers help keep lawns green, gardens plentiful, decks protected, and pests in control. With proper care, materials like high-density polyethylene and stainless steel ensure your sprayer will last season after season. However big your ambitions are, we have a sprayer to help you exceed them.
Our backpack sprayers accommodate a wide range of liquid applications—including herbicides, fertilizers, and insecticides.
By doing the mixing yourself, you can save hundreds over cost-eating, ready-to-use sprayers.
From warranty information to troubleshooting tips, we’ve consolidated a host of helpful resources. It’s part of our commitment to support you any way we can over the lifetime of your sprayer. If you can’t find what you’re looking for, we’re standing by and ready to help.
As the exclusive distributor of Swissmex to North America, we’ve expended our product offering to serve businesses even better.
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.
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.
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 email@example.com.
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.
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.
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.
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.
Typically found on three-gallon capacity sprayers and on premium two-gallon models.
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.
Heavy-duty, reinforced hose for long life. Screw-on tank connector simplifies assembly and maintenance of sprayer.
Why is a tank sprayer best for applying chemicals?
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.
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.
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.
ANY IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTY OR MERCHANTA-BILITY AND FITNESS FOR CONSUMER USE, ARE LIMITED TO THE DURATION SPECIFIED ON THE PRODUCT CARTON. ROOT-LOWELL MANUFACTURING CO.’S LIABILITY IS LIMITED SOLELY TO THE REPAIR OR REPLACEMENT OF THE NON-FUNCTIONING PRODUCT OR PART. ROOT-LOWELL MANUFACTURING CO. EXCLUDES LIABILITY UNDER THIS WARRANTY FOR ANY AND ALL INCIDENTAL AND CONSEQUENTIAL LOSS OR DAMAGE.
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.
IF YOU HAVE QUESTIONS OR CONCERNS, PLEASE CALL CUSTOMER SERVICE AT (800) 253-4642.
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.
GardenWeb Discussions – A useful gardening forum hosted on Houzz.com.
Gardening Know How – A place for gardeners, by gardeners.
GardenGirly – Featuring videos on various home-based topics.
Gardener’s Supply Company – A shopping destination for tools, seeds, and much, much more.
Sunset – Featuring landscaping tips, gardening basics, and other helpful resources.
Dave’s Garden – “An informational website where a large, international community of gardeners can learn from each other and find resources offered by the gardening industry.”
Baker Creek Heirloom Seeds – Offering 1,400 heirloom varieties of open-pollinated seeds: pure, natural, and & non-GMO.
HGTV Gardens – A gardening resource curated by HGTV.
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.
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 firstname.lastname@example.org. 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.