TE Connectivity Sealing Caps for Series 1, 2, 3 and 4 CPC Connectors Sealing caps for Series 1, 2, 3 and 4 CPC connectors made from black 94V-1 rated thermoplastic with neoprene sealing gaskets fitted with plastic straps or a metal bead chain. These sealing caps are for use with CPC receptacle connectors with the exception of stock number 745-5750 which is for use on a socket connector.