The soap injector allows you to apply soaps or cleaning chemicals at low pressure through your pressure washer. This downstream injector is designed to apply chemical only when running under low pressure (250 or less). Note: Please use the orifice black soap spray nozzle to the soap injector to work. Chemical injector has standard 3/8inch quick connect fitting. It connects pressure washer pump to hose. Dilution of chemical water can been adjusted by controlling metering valve. Works with most of gas and electric pressure washer. Suitable for cold and hot water pressure washer. Colour:gold Material:Metal Package Contents: 1 x Adjustable Chemical Injector Kit Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.