It is same style as ASCO. internal structure is spacer sleeve.we have compactly designed from 1/8" to 1/2".it have directional 5/2,3/2,5/3 way.our solenoid valves is mostly used for cylinder at any stroke. Our QT Series solenoid and air valve have good quality. We manufacture by CNC machine. The valve shaft was manufactured specially by an advanced machine. We control every step of the producing, to insure the good quality. They can work at least 30,000,000 times without any problem. The standard color for QT series solenoid/air valves body are painted in black color and the button is metal,with best coil.