1. Name: Valve Insert 2. Material: PU or NBR 3. Size: API 5#, 6#, 7# 3. Brand: Deshi Valve Insert We supply a full line of seal rubber & gaskets for piston, valve, liner, such as piston rubber(urethane, and nitrile rubber), valve insert, liner gasket seals,etc. The The materialof valve rubber is PU,and the service time is above 200 hours. valve PU or NBR insert