CHAPIN 4-Gallon ProSeries Backpack Sprayer — Diaphragm Pump, Wettable Powder & Liquid Compatible, Wide-Mouth Tank

The CHAPIN 64800 is a 4-gallon ProSeries backpack sprayer with a diaphragm pump engineered to apply liquid solutions and wettable powders for lawn, garden, and commercial tasks.

Built for homeowners, landscapers, and small commercial users, this sprayer combines a translucent 4-gallon tank, a wide four-inch opening for fast filling and cleaning, and a pump compatible with fertilizers, herbicides and many pesticide formulations. CHAPIN leverages more than a century of sprayer design to deliver a practical, serviceable tool with replaceable filters, a three-nozzle shut-off, and padded straps for extended wear.

How does the pump handle different chemicals and wettable powders?

The diaphragm-style pump is designed to resist abrasion and to tolerate both liquid concentrates and wettable powder suspensions that are commonly used in landscape and garden care. Its construction reduces the risk of clogging and can operate reliably with properly mixed formulations when paired with the in-tank filter.

• Diaphragm pump compatible with liquid and wettable powder products
• 3-stage filtration helps keep solids out of the pump
• Suitable for many fertilizers, herbicides and pesticides when mixed per label directions

How easy is it to fill, clean, and maintain?

The translucent tank shows fluid level at a glance while the 4-inch wide mouth speeds pouring and rinsing operations. The removable in-tank filter and simple pump layout reduce downtime for cleaning and part replacement, helping extend the unit’s service life.

• Wide mouth opening for quick filling and easy rinsing
• Removable, cleanable in-tank filter for sediment and grit
• Straightforward pump and shut-off design for simple maintenance

What control and spray options does it offer on the job?

The sprayer includes a cushion-grip poly shut-off valve and three interchangeable nozzles to adapt spray pattern and flow for spot treatment, broadcast coverage, or banded applications. The ergonomic shut-off and padded straps reduce fatigue during longer jobs and improve accuracy when applying chemicals.

• Cushion-grip poly shut-off for comfortable trigger control
• Three nozzles to switch between spray patterns and flow rates
• Padded shoulder straps for better weight distribution and comfort

Is the CHAPIN 64800 durable enough for regular residential or light commercial use?

The ProSeries design emphasizes durability through rugged plastics and user-serviceable parts intended for repeated use in yard, garden and small commercial settings. Routine cleaning, correct chemical mixing, and periodic filter checks will help maintain performance over many seasons.

• Robust tank material resists typical outdoor exposure
• Serviceable components designed for replacement and cleaning
• Manufacturer support and parts availability from CHAPIN

Who is this for? The CHAPIN 64800 targets homeowners who need a dependable backpack sprayer for fertilizing, weed control and pest management, plus landscapers and property managers who require a portable, serviceable sprayer for regular rounds. Choose it if you mix wettable powders or liquid concentrates, need clear tank visibility for measuring, and want a comfortable pack-style option for jobs that last an hour or more.