TE Connectivity MCP 2.8 Receptacle Inserts. MCP 2.8 unsealed receptacle inserts made from PBT-GF20. These MCP 2.8 receptacle housings accept a wire size range of 2.5mm ;sup>2 ;/sup> FLR max and are for use with MCP 2.8 carrier housings (see stock number ; 726-8900 726-8900 typically).