Piston Seals Polyurethane AU93A -31/176F [-35/80C] 290 PSI [20 Bar]

The PB-1-style  a non-symmetrical pneumatic and low pressure hydraulic piston type U-Cup. Being Uni-directional in design, two PB seals must be used , back-to-back , in separate grooves to provide bi-directional pressure sealing.