? Application: The soap injector allows you to apply soaps or cleaning chemicals at low pressure through your pressure washer. It is designed to apply chemical only when running under low pressure (250 PSI or less). ? Water Flow Adjustable: It features a controlling metering valve, which allows you to adjust the dilution ratio and increases your pressure washer's effectiveness. Water flow adjustable range is 2 GPM to 5 GPM. ? Upgraded Construction: It is made of stainless steel and brass, which is durable, long-lasting, and ensures that chemicals do not run through the pump. ? Standard M22 Couplers: The chemical injector has standard M22 connect fitting. It fits between an M22-14mm pump outlet and an M22-14mm high pressure hose. ? OEM Performance: Max 4000 PSI working pressure, works great with most brands of pressure washers, especially gas-powered washers. Work Temperature 32F to 122F (0C to 50C ), suitable for cold and hot water applications.