... ,FDA,ROHS certificated. 2,OEM service. 3,Ozone resistance,aging resistance,UV resistance Rubber Valve Product1, Material:NBR,CR,SBR,EPDM,IIR ... .2, Hardness:Between 30~90 shore A3, Property: high/low temperature resistance,oil and fuel resistance,weathering resistance,Ozone resistance etc ... or samples.8, OEM or ODM is welcomed Rubber down valve,silicone down ...