Chapin Diaphragm Pump, 4-gal. ProSeries™ Backpack Sprayer

Item # 163123

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Professional-grade sprayer that’s perfect for use with wettable powders, which may cause wear to piston pump sprayers

Since 1902, Chapin has been making professional-grade sprayers - and the Diaphragm Pump, 4-gal. Backpack Sprayer continues in their legacy of excellence. This sprayer features Viton® seals, a 20"L poly spray wand and 48"L spray hose to hit all of those hard-to-reach areas. Weighs 10.3 lbs.

  • Spray In Comfort: Sprayer features a padded shoulder and waist straps for all-day comfort
  • Customize Your Pressure: Four-position pressure adjustment from 15 to 60 psi lets you manage each unique job
  • Versatile Spray Patterns: Includes fan, cone and brass adjustable nozzles
  • Designed for You: Pump handle can be positioned on the right or left side, whichever works best for you


  • Manufacturer #: 64800
  • Faceted Pump Type: Diaphragm
  • Tank Capacity: 4 gal.
  • PSI: 60
  • Pump Type: Diaphragm
  • Hose Length: 48"