REV-O-CAP

COMBINATION SEALS, PRIMARILY FOR DYNAMIC SEALING OF CYLINDER BORES AND PISTON RODS, WITH AN ELASTOMER O-RING SQUEEZED BEHIND A SECOND ELASTOMERIC RING OF NON-CIRCULAR CROSS SECTION AND HAVING A CONCAVE CONTACT SURFACE BEARING AGAINST A SUBSTANTIAL ARC OF THE CIRCUMFERENCE OF THE CROSS SECTION OF THE O-RING