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 only when running under low pressure (250 PSI or less). Note: Please use the orifice black soap spray nozzle to get the soap injector to work. injector has standard 3/8inch quick connect fitting. It connects pressure washer pump to hose. Dilution ratio of vs 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 Injector Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.