... resistance,aging resistance,UV resistance Rubber Valve Product1, Material:NBR,CR,SBR,EPDM,IIR,NR,EP,Silicone,Viton etc.2, Hardness:Between ... 30~90 shore A3, Property: high/low temperature resistance,oil and fuel resistance ... your drawings or samples.8, OEM or ODM is welcomed Rubber down valve,silicone down valve