YAMATIC Adjustable Chemical Injector Kit for Pressure Washer — M22-14mm Downstream Soap Injector, Adjustable Metering Valve, 4500

YAMATIC Adjustable Chemical Injector Kit is a downstream soap injector that lets you meter and apply cleaning solutions through a pressure washer safely and accurately at low pressure.

This downstream injector kit pairs durable metal fittings with a controllable metering valve and siphon hose so you can introduce detergents or cleaning chemicals after the pump. It connects between an M22-14mm pump outlet and M22-14mm high-pressure hose, operates across a wide flow range, and is built to resist corrosion. Designed for use at reduced pressure (250 PSI or less) and compatible with common gas and electric washers, it gives you adjustable dilution without routing chemicals through your pump.

How does the YAMATIC injector attach to my pressure washer?

The unit uses standard M22 quick-connect fittings that insert between the pump outlet and the high-pressure hose. Installation is tool-minimal: disconnect your high-pressure hose from the pump, insert the injector coupler, then reconnect. The kit’s M22-14mm compatibility matches most consumer and professional pressure washers.

• Standard M22-14mm male/female couplers for direct fit
• Installs inline between pump outlet and hose
• No permanent modification to the pump required
• Works with most gas and electric washers rated within specified pressure limits

When and why should I use downstream (low-pressure) injection?

Downstream injection withdraws chemicals after the pump so cleaners never pass through internal pump seals. Use it for detergent application, rinsing, or when the chemical supplier recommends low-pressure delivery. Note that the injector functions only when the washer is running at low pressure (generally 250 PSI or below) and with the correct soap nozzle to draw solution.

• Prevents chemicals from contacting pump internals
• Ideal for soaps, foams, and non-corrosive cleaning agents
• Operates properly only at low-pressure spray settings
• Requires the included large-orifice black soap nozzle for siphoning

How do I control dilution and flow with this kit?

The injector includes an adjustable metering valve so you can set how much concentrate is drawn into the water stream. Water flow range compatibility spans approximately 2 to 5 gallons per minute; adjust both your washer’s flow/nozzle and the valve to achieve the desired mix ratio. Tighten or open the valve to decrease or increase chemical pickup respectively.

• Metering valve provides on-the-fly dilution control
• Effective with 2–5 GPM water flow rates
• Fine-tune mix for different surfaces and cleaners
• Simple manual adjustment—no electronics

What are the durability and operating limits of the injector?

Constructed with stainless steel and brass components, the injector resists wear and corrosion for extended service life. It’s rated for working pressures up to 4000 PSI but intended to inject chemicals only under low-pressure conditions (≤250 PSI). Temperature range covers typical cleaning scenarios from freezing to warm water use.

• Stainless steel and brass construction for durability
• Maximum working pressure: 4000 PSI (use chemicals at low pressure)
• Temperature range: 32°F to 122°F (0°C–50°C)
• Compatible with many consumer and professional washers

Who is this for: The YAMATIC Adjustable Chemical Injector Kit is suited to homeowners, detailers, and small-to-medium contractors who want precise chemical application without altering their pump. If you use a pressure washer for automotive cleaning, siding, decks, or other routine maintenance and prefer adjustable dilution and corrosion-resistant fittings, this kit provides a low-cost, easy-to-install solution. Avoid using it with highly corrosive or pump-sensitive chemicals, and always follow detergent manufacturer guidance for downstream injection.