What This Gasket Does in the Assembly
The TE Connectivity 81665-3 is a flange gasket for the CPC (Circular Plastic Connector) series, sized for Shell Size 11 receptacles with a square flange. It seals the interface between the receptacle mounting face and the panel, keeping moisture and dust out of the connector cavity. The gasket is moulded from neoprene, a material chosen for its compression set resistance and oil tolerance in industrial environments. This is an accessory — it does not carry current or terminate wires. Its job is environmental sealing for the mated connector assembly. The square profile matches the footprint of the CPC receptacle flange, and the Shell Size 11 designation tells you which receptacle body it fits.
Compatibility: Which Receptacle It Seals
The 81665-3 is designed for use with CPC receptacles that have a square flange and Shell Size 11. That covers a range of TE CPC series 1 and series 2 receptacles in the same shell size. If you are servicing a panel where the receptacle has a square mounting flange and the shell size is 11, this gasket is the correct seal. It does not fit round-flange or smaller/larger shell sizes.
Material and Construction
Black neoprene, square profile, Shell Size 11. The neoprene compound provides a compliant seal that compresses evenly when the receptacle is bolted to the panel. It holds up against oils, mild chemicals, and temperature cycling typical of industrial control cabinets and machine-tool enclosures. The colour is black, which is standard for CPC accessories.