OEM waterproof plug 1. NR, CR, NBR, SBR, VITON, EPDM, HNBR, SILICONE, BUNA, ... , etc. 2. ISO9001 3. Prompt delivery: 1 week OEM waterproof plug MaterialNR,CR,NBR,SBR, SILICONE,VITON,EPDM, HNBR, BUNA, etc ... by the customerRubber CompoundCan be UL, FDA, ROSH or REACH approved, and free test slabs and hardness testers can be offered ...