Chapin 63985 4-Gallon 20v wide Mouth Backpack Sprayer, Powered by Black & Decker


PrintWarning: Cancer and Reproductive Harm.

Print Advertencia: Cáncer y Daños Reproductivos.

PrintAvertissement: Cancer et Dommages Reproductifs.


  • Black & Decker 20-volt Lithium Ion battery
  • Up to 1.75 hours of continuous spraying
  • 4-gallon translucent tank
  • 6-inch wide mouth funnel for easy filling and cleaning
  • 35-40 psi
  • 20-foot maximum horizontal spray stream and up to 27-foot vertical spray stream
  • Cushion grip shut-off with built-in, serviceable filter to assure that no debris can clog the nozzle tip
  • Shoulder straps included
  • Battery and charger included


  • General Purpose Cleaning
  • Fertilizers
  • Weed & Feed
  • Fungicides
  • Herbicides
  • Pesticides


Chapin Product Manual graphic - red book with Product Manual

Chapin 63958 Product Manual


Tips & Maintenance Videos

Technical Specs

Model Number 63985
Tank Size 4-gallon
Tank Mouth Opening 6-inches
Tank Construction poly
Pump Type 20-Volt battery electric
Hose Length 48-inches
Hose Material clear reinforced
Shut-Off Material poly cushion-grip
Lock-On Feature none
Anti-Siphon Feature N/A
Battery Type lithium ion
Spray Hours 1.75 hours per charge
Warranty 2-Year Limited
Spray/Flow Rate (GPM) .4-.5 gpm
Nozzle(s) adjustable brass cone, poly-fan, poly-cone
Filters 3-stage
Frame powder-coated steel
Handle N/A
Shipping Weight In Pounds 12
Package Dim. In. (LxWxH) 15.0 x 9.25 x 22.15
Item Dim. In. (LxWxH) 14.75 x 9.0 x 21.9
Item Weight In Pounds 12
Pressure relief valve N/A
Extension Wand Material poly
PSI - Operating Pressure 35-40 psi
Motor Size none
Extension Wand Length
Spray Stream Max Vertical
up to 27-feet
Spray Stream Max Horiz.
up to 20-feet


*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.

Customer Reviews
5 Based on 4 Reviews
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One of the best purchases I ever made

I bought this about 3 years ago to replace my hand pump backpack sprayer. It was working fine but I was tired of pumping it by hand for long periods. I immediately loved this. Yesterday it quit pumping. It seemed like either it wasn't getting power or the pump went bad. I called customer support and Linn returned my call. He walked me through all the things that could be causing the problem. When I did these things, Found that one of the filters was clogged, causing the switch to think there was enough pressure already. Once I cleaned the filters, it worked great again. From now on, I will never put it away without running clear water through it, disasembling and cleaning the filters. Love this thing and wouldn't want to be without it.

Neil H.
United States United States
Excellent product. Highly recommended

Excellent product. Highly recommended

United States United States
Order # 23814

shipment is back to you guys and I don't know what to do. Unfortunately, bad. When we order we put our USPS address HC 3 BOX 19948 ARECIBO P.R. 00612 and your company shipped UPS. While the shipment was in Puerto Rico I Email you to change the delivery address but Yill Yanus from eCommerce to that she could not charge it. I Call UPS and they told that the only one that can change it is the shipper. Now the Please contact me A.S.A.P. Asociacion de Productores de Leche (Farmers Coop) Carr. 129 Km 7.3 Bo. Dominguito Arecibo, P.R. 00612 Tel: (787) 878-9255 Email:

Terry M.
United States United States
Best Chapin Sprayer yet!

I have only used this sprayer twice, but it is by far that best Chapin sprayer I have purchased to date. The wide fill mouth makes it easy to fill without spilling. The battery connection on the bottom of the unit is easy to take out to charge and install. Four gallon capacity is a bit much weight for my old frame, but the unit sits nicely on my side by side seat to spray while riding. Not needing to pump the tank for pressure is its biggest asset. I love this sprayer and would quickly recommend that it is worth the expense.