... O-ring:material high-end NBR (3)Life:30,000,000 times life Our factory to provide high-end spacer ... stable armature,at the same time, extending using life.C: Solenoid valve coil 1.We equipped with ... design to avoid the Spring be compressed many times and deformation,so the valve rod can't accurate ... 3.A little bit dustproof.4.30,000,000 times life.F: Solenoid valve shaft and Spacer material1.Shaft: ...