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


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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, general purpose cleaning

    Can be used for disinfection only when using a diluted mixture of bleach per the CDC guidelines. CDC states: 5 tbsp (1/3 C) of bleach per gallon of room-temperature water or 4 tsp of bleach per quart of room-temperature water. 

    Documents & Support

    Chapin 63900 Product Manual
    Chapin Warranty Information 
    Backpack Sprayer Technical Support Videos
    Chapin 63900 Backpack Sprayer video

    Technical Specs

    Model Number 63900
    Tank Size 4 g (15 L)
    Tank Mouth Opening 6 in (15 cm)
    Tank Construction poly
    Frame chrome-plated
    Filters self-cleaning with in-tank filter
    Nozzle(s) adjustable brass cone, poly-fan, poly-cone
    Shoulder strap deluxe padded straps with lumbar support
    Extension Wand Material stainless steel
    Extension Wand Length 20 in (51 cm)
    Handle right or left mounted
    Lock-on Feature yes
    Shut-Off Material poly cushion-grip
    Seal Material chemical-resistant
    Pump Type piston over diaphragm
    Hose Length 48 in (122 cm)
    Hose Material clear, reinforced
    Spray/Flow Rate (GPM) 0.4 - 0.5 gpm
    Spray Stream Max Vertical 23 ft (7 m)
    Spray Stream Max Horizontal 25 ft (7.6 m)
    Operating Pressure 40-60 psi
    Item Dimensions (LxWxH) 8 in x 8 in x 18 in (20 cm x 20 cm x 46 cm)
    Item Weight 10.5 lb (4.76 kg)
    Warranty 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.