... Valve Product1, Material:NBR,CR,SBR,EPDM,IIR,NR,EP,Silicone,Viton etc.2, Hardness:Between 30~90 shore A3, Property ... .4, Certification:ISO9001:2008, ROHS,FDA5, Packing:plastic bag&carton box or according to your requirements.6,Application:electronic field, industrial ... samples.8, OEM or ODM is welcomed Rubber down valve,silicone down valve