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Easy to use. The M4’s large wide mouth opening allows for easy filling and features a screen filter to keep dirt/debris out of tank. On/Off and variable flow switches are accessible while you’re wearing the system and indicator lights tell you when it’s time to charge the battery.

Reduce your spray time by 50%. Your spray time is cut in half, compared to manual sprayers! The M4’s large capacity sprays up to 200 gallons on a single charge. That’s equivalent to 50 tankful’s with a manual sprayer.

Superior control. The M4 system has an adjustable-length, stainless steel wand and works with the largest selection of brass and plastic spray nozzles, including cone, t-jet (flat), double cone, and directed fog. For more gentle applications, a 3-D FLEXTIP enables access to spray under leaves and into hanging potted plants. The silver rotary switch allows flow control from 20PSI to 60PSI. 

Works with most liquid solutions. The M4 pump easily sprays most natural and chemical solutions including acids, bleaches, solvents and cleaners. This includes lawn care and pest control products like Roundup, cleaning products like Wet and Forget, fence and deck stains, concrete sealants like LastiSeal, diesel, oil, de-icers, alcohol, mineral spirits, and much more. (Please note that the M4 system is not compatible with muriatic acid.)

Improved safety and ergonomics. The M4’s locking trigger prevents accidental spraying while heavy-duty shoulder straps are bolted to the sprayer to prevent accidental disconnection and/or dropping. The M4 is also much safer than manual sprayers if you need to climb ladders because it leaves one hand free to hold on. We also offer a cart and extended hose so you can leave your backpack on the ground while climbing ladders!

Long battery life. You’ll find a fully automatic solid-state charger included with each backpack that reaches a full charge in 8 hours or less! The charger automatically switches from full charge to trickle and can be left plugged in all year long to optimize the battery life.

Built to last. With proper maintenance, which includes regular cleaning and replacement of the motor and battery every few years, the M4 should last a lifetime. 

Unmatched product support. Each M4 system comes with technical support via phone and/or email and a 2 year warranty.

Final assembly and quality tested in the USA.

Video Tutorials

M4 Battery Powered Backpack Sprayer Quick Start

Overview of Parts Shipped with MY4SONS M4

M4 Sprayer Nozzle Kit

14 Foot Telescope Wand

Customer Testimonials

It may sound like a cliche, but for us, it couldn't be more true. We really pride ourselves on having a great relationship with our customers and doing our best to answer any and all questions, concerns, and suggestions, all while providing excellent backpack sprayers and parts... But don't just take our word for it. Hear it from other customers:

I'm part of a small painting company, and I just wanted to take a minute to thank you for your M4 backpack sprayer... Part of painting exteriors is to spray the ENTIRE HOUSE, from the top of the roof to the ground line around the slab. This was a TWO DAY operation with an ECHO pump sprayer. Not only that, but I have an artificial rotator cuff in my left shoulder, AND NO ONE makes a right hand pump. (WTF?!!)

Your sprayer not only works fantastically as advertised, it took a two day job, and cut it down to only 3 hrs!!

It would be WORTH it if I had to buy one for every house I did!! (Let's hope it doesn't come to that though, lol). After my 2nd house now with your equipment and going strong. Me and my bad shoulder THANK YOU!

— Andy S

I appreciated the great service you guys provided. Thanks Lance.

— Yves G

I just cannot get enough of your sprayer and the quality of the product.

Your sprayer has kept my tomato plants healthy and viable using DE powder and I have plants that are almost 9 feet tall. Last night I pulled a 3.2 lb beefsteak tomato off the vine.

Last but not least, and without disclosing too much, you have got to tap into the world of cannabis growers! Your units are perfect for aerating the solutions without having to constantly be pumping. The ability to leave them plugged in 24/7 and not to worry about over charging, potential of fire etc. You are a perfect fit, and I cannot imagine how your business could explode tapping into that rapidly growing industry.

— Roy B