Comet P40 Softwash Pump and Gearbox 11 GPM Flow 300 PSI

Comet P40 Softwash Pump

11 GPM Flow. 300 PSI Control. Built for Bleach Work.

If you're building or upgrading a softwash system, the Comet P40 is a proven diaphragm pump designed to handle the chemicals that destroy lesser pumps.

With up to 11 GPM at 300 PSI, this pump delivers the volume you need for roof cleaning, house washing, agricultural spraying, and pest control — all while running at a low 550 RPM for long service life.

Designed for Softwash & Chemical Applications

Unlike piston pumps that struggle with aggressive solutions, the P40 uses a 3-diaphragm high-performance design that:

✔ Handles sodium hypochlorite and common softwash mixes
✔ Provides consistent flow without pressure spikes
✔ Reduces wear in chemical-heavy environments
✔ Offers smooth, reliable operation

This is the kind of pump built for bleach duty.

Built to Last

✔ Durable Polypropylene Pump Body – Excellent chemical and corrosion resistance
✔ Molded One-Piece Collector with Centralized Inlet – Fewer leak points, easier maintenance
✔ Heavy-Duty 3/4" Solid Shaft Gearbox – Reliable power transmission
✔ Metal Oil Cup with Visible Level – Quick oil checks and fast service
✔ Low Operating RPM (550 Max) – Longer diaphragm life

Performance Specs

• Max Flow: 11.0 GPM
• Max Pressure: 300 PSI
• Max RPM: 550
• Max HP: 2.3
• Oil Capacity: 30.4 fl oz
• Diaphragms: 3

Ideal For

• Roof soft washing
• House washing
• Agricultural spraying
• Lawn care applications
• Pest control systems

Bottom Line

If you need a dependable, chemical-ready pump that delivers serious volume without high pressure, the Comet P40 is built for the job.

Pressure gauge not included

High flow. Low RPM. Made for softwash.