O-ring envelope gasket
O-ring forming sealing washer
O-ring insert
O-ring port contour sheath and seal
O-ring seal for rock bit bearings
O-ring seal seating arrangement for rotary plug valve
Oil closure for shaft bearings
Oil control piston ring assembly
Oil control ring
Oil control ring spacer-expander with improved slip latch
Oil control ring spacer-expander with improved slip latch
Oil controlled piston and oil control means
Oil cooled piston
Oil cooled piston rings
Oil damped piston
Oil deflector for shaft seal with forced ventilation
Oil drain back hole with stopper bead
Oil passage arrangement in a piston
Oil retainer
Oil retainer