Chemical injector has standard 3/8inch quick connect fitting. It connects pressure washer pump to hose. Dilution ratio of chemical vs water can been adjusted by controlling metering valve. 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 PSI or less). Note: Please use the large orifice black soap nozzle to get the soap injector to work. Works with most of gas and electric pressure washer. Suitable for cold and hot water pressure washer., Weight: 1.13427833799 Pounds, Manufacturer: Tuidzljd