Parker's PSP Profile seal is a squeeze type, bi-directional piston seal for use in medium-duty hydraulic applications. Available from proprietary Parker polyurethanes, the PSP offers low friction, abrasion, and extrusion resistance. The NBR elastomer energizer ring ensures resistance to compression set to increase seal life. The PSP seal's geometry provides a fluid reservoir between the two sealing lips which holds system fluid, resulting in reduced breakaway and running friction. Designed to retrofit grooves for a single O-ring or an O-ring with two back-ups, the PSP profile is easy to install and resist rolling and twisting in long stroke applications.