If you are going to buy cheap,Website:http://www.airkir.com, newest and high-quality check valve products from one productive factory, Fenghua Airkir Pneumatic Equipment Co.,Ltd is one of the professional check valve manufacturers in China.We have various different valves like solenoid valves, pneumatic valves, mechanical valves, etc. Aboutsolenoid valve,there are 5/2,5/3,3/2,2/2 with different connection ports,pressure,temperature,medium,etc. The material can be aluminium, brass, stainless steel and engineering plastic, which are widely usedifferent conditions together with control elements.