Earls Bulkhead fittings available in a range of sizes and configurations.
Steel Bulkhead nuts to suit -3AN and -4AN – see QA1 Jam Nuts: -3AN – JNR6S (right hand thread, 3/8″) -4AN – JNR7S (right hand thread, 7/16″)
Enquiring about: EARLS BULKHEAD FITTINGS