63900: 4-Gallon (15-Liter) Self-Cleaning Backpack Sprayer


  • $142.99
    Unit price per 
Shipping calculated at checkout.

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Chapin combined so many features into our 63900 self-cleaning backpack sprayer. Whether you're a DIYer or a professional this sprayer tackles jobs with ease.

It offers an innovative and patented JetClean, self-cleaning pump technology, directing a powerful burst of liquid through the tank filter with each downward pump stroke. The filter stays free of debris and virtually eliminates clogging! The benefits continue with a 4-Gallon (15-liter) translucent poly tank with an extra-wide mouth opening for easy filling and cleaning, a 3-stage filtration system, cushion grip poly shut-off, 3 nozzles for a variety of applications and a stainless-steel wand. The swing-away pump handle can be set up for either right or left-hand use and it folds up when you’re done. Compatible with common fertilizers, weed killers and pesticides.
  • 4-gallon (15-liter) translucent tank
  • Patented JetClean self-cleaning pump technology with 3-stage filtration system to keep filter clog-free from debris and residue
  • Stainless-steel wand with cushion grip poly shut-off
  • Swing-away handle for right or left hand use, folds up for storage
  • 3 nozzles: fan, cone and adjustable brass
  • Padded shoulder straps and back pad for hours of comfortable spraying
  • Compatible with common fertilizers, weed killers and pesticides

    Applications: fertilizing, weed and pest control, fungus control

    Technical Specs

    Model Number


    Tank Size (gallons)

    4 (15 L)

    Tank Mouth Opening (inches)

    6 (15 cm)

    Tank Material


    Pump Type 

    piston over diaphragm

    Hose Length (inches) 

    48 (122 cm)

    Hose Material 

    clear, reinforced, PVC

    Extension Wand Length (inches) 

    20 (51 cm)

    Extension Wand Material 

    stainless steel

    Seal Material 


    Shoulder Straps 



    adjustable brass, poly fan, adjustable poly cone


    3-stage, self-cleaning


    right or left mount, metal-alloy

    Frame Material

    chrome plated

    Shut-off Material 

    poly cushion grip

    Lock-on Feature 


    Pressure Relief Valve 


    Spray/Flow Rate (GPM) 


    Operating Pressure (PSI) 


    Item Dimensions (L x W x H – inches)

    14.75 x 9 x 21.9

    Item Weight (pounds)



    5-year limited


    *Spray distance is dependent on many factors such as adjusted nozzle orifice size, tank pressure, wind interference and angle of inclination. Spray distances may vary based on user's specific application.

    Due to our ongoing product improvement process, product specifications may change without notice.