– Made of high-quality polyoxymethylene POM-C
– Teflon coating to reduce friction and increase movement
– Ball-bearing so that the spring can rotate freely and not deform and decrease spring tension
– 2 O-rings, to aid alignment and prevent air loss
– 11 ventilation holes, these prevent a vacuum when mounting and press the sealing ring against the cylinder for an optimal sealing
– For narrower cylinders, a separate O-ring is included
– Suitable up to m140 spring