JOEJET Pressure Washer Downstream Injector 3–5 GPM — Brass/Stainless, 3,200 PSI, Includes Adapters & Hose

JOEJET Fixed Downstream Injector is a brass and stainless steel chemical siphon that fits between your pressure washer pump and hose to deliver diluted detergent safely at 3–5 GPM.

This compact downstream injector draws cleaning solution from a remote container using the siphon principle, protecting your pump from direct chemical exposure while letting you apply soaps and detergents accurately. Built for durability and quick installation, it handles up to 3,200 PSI and is supplied with adapters, a siphon hose, a filter and a soap nozzle so you can get started right away.

How does the JOEJET injector attach to my pressure washer?

Installation is straightforward: connect the injector inline between the pump outlet and your high-pressure hose. The unit uses 3/8" quick-connect fittings on both ends and includes adapters to match common NPT fittings.

• 3/8" quick-connect fittings for fast hookup
• Included 3/8" QC-to-3/8" NPT adapters for compatibility
• Inline design prevents chemical backflow into the pump
• Follow the directional arrow on the body for correct flow

What cleaning performance can I expect at 3–5 GPM?

At flow rates between 3 and 5 gallons per minute, the injector meters detergent reliably for medium- to heavy-duty outdoor cleaning tasks. It supplies a consistent chemical feed without reducing your washer’s pressure output when installed correctly.

• Effective for driveways, siding, roofs, vehicles and decks
• Maintains pressure up to 3,200 PSI when properly installed
• Produces steady detergent draw for consistent coverage
• Comes with a black soap nozzle optimized for low-pressure chemical application

What materials and durability features keep chemicals from corroding the injector?

Key wetted parts are manufactured from brass and stainless steel, materials chosen for resistance to many cleaning chemicals and longer service life. The injector also includes a replaceable filter to keep particulates from clogging the siphon line.

• Brass body and stainless steel internals resist corrosion
• Rated to withstand pressures up to 3,200 PSI
• 10 ft siphon hose and inline filter reduce clogging
• Comes with Teflon tape for leak-free threaded connections

What comes in the package and what should I check before use?

The kit contains everything required to start: the brass downstream injector, adapters, quick-connect fittings, siphon hose, filter, soap nozzle and sealing tape. Before first use, ensure the arrow on the injector aligns with water flow and confirm all threaded joins are sealed.

• Brass downstream injector and black soap nozzle included
• 3/8" QC plug-to-NPT and QC socket-to-NPT adapters supplied
• Two rolls of Teflon tape for secure, leak-free threads
• 10 ft siphon hose with filter for stable detergent draw

Who is this for: The JOEJET Fixed Downstream Injector is designed for homeowners, professional cleaners and contractors who need a reliable, easy-to-install chemical feed for medium-flow pressure washers (3–5 GPM). If you want to apply cleaners evenly while protecting your pump from direct chemical exposure—and want durable brass and stainless steel construction with basic accessories included—this injector is a practical option.