The Hubbell Wiring Device-Kellems HBLFCAPR Cap is a red protective cap designed for wiring devices. It is made of thermoplastic elastomer material with a NEMA enclosure rating of 12. The cap is compatible with Series 16 and 4X devices, featuring a female style and an overall length of 2.57 inches. This product is suitable for cold environments and is designed to provide protection for wiring devices with a current of up to 400A.