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  • Home
  • Benefits
    • Benefits
    • Testimonials
  • M4 bundles
    • M4 Backpack Bundles
    • M4 Agitator Bundle
    • DeWalt Milwaukee and other battery upgrade options
    • M6 Bundle
    • M4 upgrade kits
      • Agitator upgrade kit
      • Battery upgrade kit
      • Waist strap upgrade kit
      • Electrical upgrade kit
    • M2 2 gallon sprayer
    • M1 2.5 gallon sprayer
  • Parts & Accessories
    • Parts & Accessories
    • NEW PRODUCTS
    • HYDRAULIC
      • WANDS (14ft telescoping, 4 boom, etc))
      • HOSE (15ft, Coiled, Standard, Elbow, etc)
      • NOZZLES (QR, Flexi, Fan, Cone, , Multinozzle, etc)
      • VALVES/PISTOLS
      • QUICK RELEASE/WASHERS/O-RINGS/ADAPTERS
      • Washers/O-rings
      • Quick Release
      • Adapters
    • ELECTRIC
      • Pumps
      • Switches
      • Batteries
    • STRUCTURAL
      • Lid
      • Filters
      • M4 Pockets and storage
      • Straps/Buckles
      • Base plate screws
      • Tanks
  • Videos
    • Videos
    • New Customer
      • Quick start
      • Overview of parts shipped with the M4 Backpack Sprayer
      • Nozzle kit Overview
      • Assembly and final inspection
      • My4sons Quality Care
      • Top 10 reasons why the MY4SONS M4 is rated #1 on amazon
      • M4: Charging and rotary switch use
      • How to prime the M4 Backpack Sprayer using A garden Hose
    • New For 2024
      • New For 2024
      • Monster Cart
    • Part/Accessories
      • 14 ft telescoping wand video
      • 14ft telescoping wand adapting to other sprayers
      • M4 New super wide XXL water Tight Lid Seal
      • Wide Lid Preview
      • Spray Pistol
    • Electric
      • New Wireless Remote Control for the M4!
      • 2021 Electrical Upgrade Kit
      • Battery and Multimeter
    • Troubleshooting
      • Quick Fix#1 no power, no voltmeter lights
      • Quick Fix #2 no power but voltmeter lights on
      • 5 step diagnostic checklist
      • M4: Charging and rotary switch use
      • Is my battery good?
      • Solving a collapsing tank
    • Maintenance
      • The best way to wire the M4
      • Securing Shoulder Strap anchor screw
      • Changing the red valve handle piston
      • Getting rid of leaks
      • How to prime the M4 Backpack Sprayer
    • Part Replacement
      • Replacing the pump
      • Replacing a broken pump neck
      • Replacing the red and rotary switches
  • FAQ
  • About Us
    • A Message From Our Founder
    • Assembly and final inspection
    • Customer Testimonials
    • Contact us
Log in
    MY4SONS
    • Home
    • Benefits
      • Benefits
      • Testimonials
    • M4 bundles
      • M4 Backpack Bundles
      • M4 Agitator Bundle
      • DeWalt Milwaukee and other battery upgrade options
      • M6 Bundle
      • M4 upgrade kits
        • Agitator upgrade kit
        • Battery upgrade kit
        • Waist strap upgrade kit
        • Electrical upgrade kit
      • M2 2 gallon sprayer
      • M1 2.5 gallon sprayer
    • Parts & Accessories
      • Parts & Accessories
      • NEW PRODUCTS
      • HYDRAULIC
        • WANDS (14ft telescoping, 4 boom, etc))
        • HOSE (15ft, Coiled, Standard, Elbow, etc)
        • NOZZLES (QR, Flexi, Fan, Cone, , Multinozzle, etc)
        • VALVES/PISTOLS
        • QUICK RELEASE/WASHERS/O-RINGS/ADAPTERS
        • Washers/O-rings
        • Quick Release
        • Adapters
      • ELECTRIC
        • Pumps
        • Switches
        • Batteries
      • STRUCTURAL
        • Lid
        • Filters
        • M4 Pockets and storage
        • Straps/Buckles
        • Base plate screws
        • Tanks
    • Videos
      • Videos
      • New Customer
        • Quick start
        • Overview of parts shipped with the M4 Backpack Sprayer
        • Nozzle kit Overview
        • Assembly and final inspection
        • My4sons Quality Care
        • Top 10 reasons why the MY4SONS M4 is rated #1 on amazon
        • M4: Charging and rotary switch use
        • How to prime the M4 Backpack Sprayer using A garden Hose
      • New For 2024
        • New For 2024
        • Monster Cart
      • Part/Accessories
        • 14 ft telescoping wand video
        • 14ft telescoping wand adapting to other sprayers
        • M4 New super wide XXL water Tight Lid Seal
        • Wide Lid Preview
        • Spray Pistol
      • Electric
        • New Wireless Remote Control for the M4!
        • 2021 Electrical Upgrade Kit
        • Battery and Multimeter
      • Troubleshooting
        • Quick Fix#1 no power, no voltmeter lights
        • Quick Fix #2 no power but voltmeter lights on
        • 5 step diagnostic checklist
        • M4: Charging and rotary switch use
        • Is my battery good?
        • Solving a collapsing tank
      • Maintenance
        • The best way to wire the M4
        • Securing Shoulder Strap anchor screw
        • Changing the red valve handle piston
        • Getting rid of leaks
        • How to prime the M4 Backpack Sprayer
      • Part Replacement
        • Replacing the pump
        • Replacing a broken pump neck
        • Replacing the red and rotary switches
    • FAQ
    • About Us
      • A Message From Our Founder
      • Assembly and final inspection
      • Customer Testimonials
      • Contact us
    Log in Cart

    Collections

    • Valves/Pistols/Wands

      Purchase pistols, valve parts and wands accessories for the M4 Backpack Sprayer 

      Valves/Pistols/Wands

    • Wand pockets and storage

      Wand pockets and storage

    • Wands

       

      Wands

    • Wands and wand accessories

      Wands and wand accessories

    • Washers/o-rings

      Washers/o-rings

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    Final assembly and quality tested in the USA

    2 Year Warranty — 30 day returns for unused items minus the cost of shipping. / Patents Pending. / Please note that the M4 system is not compatible with muriatic acid.

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