1.The car washing machine has no problems such as pressure and no water, just simply replace the pump head. 2.The pump head is a set of assemblies, including water inlet and outlet valves and other accessories. 3.The pump head is used for the guide car S6 S2 S3 S1,for ,for STT all series,available for white horse series and series. 4.The quality of the pump head directly determines the pressure and the length of the service life of the cleaning machine. It is very important to choose the right product. 5.The powerful water pressure is powerful, which can easily wash away the dust and dirt without damaging the paint. Application: Car washing machine accessories Structure: Booster pump Power: Electric Pressure: High pressure Voltage: 220v Maximum pressure: 20Mpa 2900psi Maximum volume: 550L/H Use motor speed: 2700RPM-3900RPM Water inlet thread: G3/4 Outlet burst pattern: M22x1.5 (inner diameter 15mm) Power: 600w-2500w Colour: black Material: plastic Package Contents: 2 x Pump Head Assembly 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.