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  • Home
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  • Benefits
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    • All Bundles
    • M4
    • M6
    • M4 + Agitator
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    • HYDRAULIC
      • WANDS (14ft telescoping, 4 boom, etc))
      • HOSE (15ft, Coiled, Standard, Elbow, etc)
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  • 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 2026
      • New For 2026
      • 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
  • About Us and FAQ
    • A Message From Our Founder
    • Assembly and final inspection
    • Customer Testimonials
    • Contact us
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Log in
    MY4SONS
    • Home
    • Product Search
    • Benefits
      • Benefits
      • Testimonials
    • Discount Bundles
      • All Bundles
      • M4
      • M6
      • M4 + Agitator
      • M4 18-20V (DeWalt, Milwaukee, etc.)
      • M4 upgrade kits
        • Agitator upgrade kit
        • Battery upgrade kit
        • Electrical upgrade kit
      • M2
    • Parts & Accessories
      • New Products
      • Valve Handle Trigger
      • Batteries
      • Wands
      • Pumps
      • Nozzles
      • 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 2026
        • New For 2026
        • 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
    • About Us and FAQ
      • A Message From Our Founder
      • Assembly and final inspection
      • Customer Testimonials
      • Contact us
      • FAQ
    Log in Cart
    • M4 Valve Handle (ONE PIECE - COMPATIBLE WITH ACIDS AND BLEACHES)

      M4 Valve Handle (ONE PIECE - COMPATIBLE WITH ACIDS AND BLEACHES)

      M4 Valve Handle (ONE PIECE - COMPATIBLE WITH ACIDS AND BLEACHES)

      Regular price $ 9.99 USD
      Regular price $ 9.99 USD Sale price $ 9.99 USD
      Unit price /  per 
    • M4 PRO SPRAY PISTOL+ QUICK RELEASE (STAINLESS STEEL AND BRASS) With 5ft brass hose and strain relief brass hose

      M4 PRO SPRAY PISTOL+ QUICK RELEASE (STAINLESS STEEL AND BRASS) With 5ft brass hose and strain relief brass hose

      M4 PRO SPRAY PISTOL+ QUICK RELEASE (STAINLESS STEEL AND BRASS) With 5ft brass hose and strain relief brass hose

      Regular price From $ 16.99 USD
      Regular price $ 0.00 USD Sale price From $ 16.99 USD
      Unit price /  per 
    • 14 Foot Spray Telescope (WORKS WITH MOST CHEMICALS INCLUDING ACIDS, BLEACHES, SOLVENTS)

      14 Foot Spray Telescope (WORKS WITH MOST CHEMICALS INCLUDING ACIDS, BLEACHES, SOLVENTS)

      14 Foot Spray Telescope (WORKS WITH MOST CHEMICALS INCLUDING ACIDS, BLEACHES, SOLVENTS)

      Regular price $ 34.99 USD
      Regular price Sale price $ 34.99 USD
      Unit price /  per 
    • Pressure Washer Style Valve Trigger Handle ( Includes Quick Release)

      Pressure Washer Style Valve Trigger Handle ( Includes Quick Release)

      Sale

      Pressure Washer Style Valve Trigger Handle ( Includes Quick Release)

      Regular price $ 16.99 USD
      Regular price $ 29.99 USD Sale price $ 16.99 USD
      Unit price /  per 
      Sale
    • Red Piston ( valve handle replacement part)

      Red Piston ( valve handle replacement part)

      Sale

      Red Piston ( valve handle replacement part)

      Regular price $ 0.50 USD
      Regular price $ 1.00 USD Sale price $ 0.50 USD
      Unit price /  per 
      Sale
    • Spray Pistol Flow Control Valve (Brass/Stainless Mini Ball Valve)

      Spray Pistol Flow Control Valve (Brass/Stainless Mini Ball Valve)

      Sale

      Spray Pistol Flow Control Valve (Brass/Stainless Mini Ball Valve)

      Regular price $ 9.99 USD
      Regular price $ 19.99 USD Sale price $ 9.99 USD
      Unit price /  per 
      Sale
    • Mini Brass Flow/On/OFF Valve (SOLVES DRIPPING AND MICRO FLOW!!)

      Mini Brass Flow/On/OFF Valve (SOLVES DRIPPING AND MICRO FLOW!!)

      Mini Brass Flow/On/OFF Valve (SOLVES DRIPPING AND MICRO FLOW!!)

      Regular price $ 4.99 USD
      Regular price Sale price $ 4.99 USD
      Unit price /  per 
    • Valve Handle Spring (External) with Cabletie (Corrosion "Proof") Not Installed

      Valve Handle Spring (External) with Cabletie (Corrosion "Proof") Not Installed

      Valve Handle Spring (External) with Cabletie (Corrosion "Proof") Not Installed

      Regular price $ 2.99 USD
      Regular price Sale price $ 2.99 USD
      Unit price /  per 
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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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