... ,aging resistance,UV resistance Rubber Valve Product1, Material:NBR,CR,SBR,EPDM,IIR,NR,EP,Silicone,Viton etc.2, Hardness ... ISO9001:2008, ROHS,FDA5, Packing:plastic bag&carton box or according to your requirements.6,Application:electronic field, industrial machine ... , medical equipment industry etc.7, According to your drawings or samples.8, OEM or ODM is welcomed Rubber down valve,silicone down valve