Conduit locknut from Plasti-Bond

Built to protect conduit systems, the Plasti-Bond PVC-coated sealing locknut has a built-in gasket at its face to provide a positive seal against water, oils and other liquids. An integral sleeve on the reverse side fits over the circumference of the adjacent coated conduit; it threads on only 2 1/2 in. threads, leaving at least 7 threads for the complete engagement of the conduit to its connected fitting.

Plasti-Bond; https://plastibond.com