Comet VRT-3 Pressure Washer Unloader — 4500 PSI, 10.5 GPM, 3/8" FNPT, Brass Body with Black Knob

The Comet VRT-3 Unloader is a brass pressure-washer pressure-relief valve that protects pumps and lets you fine-tune up to 4,500 PSI and 10.5 GPM with simple 3/8" FNPT plumbing.

Built for heavy-duty cleaning systems, the VRT-3 Series unloader reduces strain on your pump by diverting flow when the spray gun is closed and providing fast, reliable pressure adjustments via its user-friendly knob. It fits common pump brands and installs quickly using standard 3/8" FNPT inlet, outlet and by-pass ports. Rated to handle hot water up to 194° F, the unit combines durable brass construction with a compact design for workshop, fleet, or rental use.

How does the VRT-3 protect my pressure-washing pump?

The unloader prevents pressure spikes and backflow when the trigger gun is shut, routing flow through a by-pass so the pump runs without building damaging pressure. That reduces cycling and heat buildup in the pump, extending service life without complicated plumbing changes.

• By-pass diverts water when trigger is closed via 3/8" port
• Responds to both pressure increases and flow changes
• Brass body resists corrosion for longevity
• Black knob allows quick pressure dialing to match system needs

Will this unloader work with my existing pressure-washer pump?

The VRT-3 is compatible with many common pumps, including Comet, AR North America, General and other branded units that use 3/8" FNPT connections. Confirm your system’s maximum pressure and flow are at or below the VRT-3 rating before installation.

• 3/8" FNPT inlet, outlet, and by-pass for straightforward plumbing
• Handles up to 4,500 PSI and 10.5 GPM—check pump specs to match
• Works on both cold- and hot-water systems (max 194° F)

How do I adjust pressure and what tools do I need?

Adjustments are quick: use the colored knob to increase or decrease system pressure without special tools. The black spring and knob assembly give tactile feedback so you can fine-tune output to match nozzles, cleaning tasks, or surface types.

• Turn knob clockwise to raise pressure, counterclockwise to lower it
• No disassembly required for most adjustments or routine checks
• Standard wrenches are all that’s needed for plumbing during installation

What are the installation and temperature limits?

Installation is straightforward with the 3/8" FNPT ports—thread into your plumbing or adapter fittings using standard sealant or tape. The unloader is rated to operate safely up to 194° F, making it suitable for many hot-water cleaning applications when paired with compatible pumps and hoses.

• 3/8" FNPT threads for inlet, outlet, and by-pass—easy to fit
• Maximum operating temperature: 194° F (ensure pump and hoses match)
• Brass construction for heat resistance and durability

Who this is for: The Comet VRT-3 Unloader is ideal for professionals, rental shops, and serious DIYers who need a compact, durable pressure-relief solution that simplifies pressure control and protects their investment. Choose this unloader if you run systems up to 4,500 PSI and 10.5 GPM, need hot-water compatibility to 194° F, and want easy 3/8" FNPT hookups for fast installation and service.