Leak Free Lid Bulkhead w/ O-Ring Washer & Lock Nut
1/4" FNPT x 5/16-18 Bulkhead.
This bulkhead has a 1/4" FNPT threaded adapter and a 5/16-18 threaded screw adapter and is made out of nickel plated brass and comes with a Buna-N O-ring, stainless steel washer, and nylon locknut.