The PUN is a popular non-symmetrical piston seal.The knife trimmed, beveled lip contacts the bore to provide enhanced low to high pressure sealing and wiping action, providing excellent wear, extrusion and compression set resistance. With Retainer Ring， providing a better performance of high pressure extrusion resistance, and the O-ring provide a better tension for sealing performance.
| Materials | Operating Condition | ||
| Temperature ℃ | Pressure Range Mpa | Speed m/s | |
| PU | -30~110 | 70 | 0.5 |
