... of piston construction and viton seal.It is 4/2 way solenoid valve (one inlet port,2 working ports,one exhaust port ... same with function of one 2/2 way (NC type) and one3/2 way solenoid valve. it can reduced the cost of material ... line simple. this valve is with simpleconstruction,small size,good sealing,easy fixing.Order Code:size: KL0311 4 way electronic valves for ...