Image Dix-Lock® N-Series Bowes Interchange Female Threaded Safety-Lock Plug Markets Maintenance Repair Operations (MRO), Mining, Steel Processing Product Options Part Number Length Maximum OD Body Size Thread Thread Size Pipe Thread Material N4F4-B-LS 2.92" (74.0 mm) 1.31" (33.3 mm) 1/2" NPTF 1/2" NPT / NPTF Brass N4F6-B-LS 3.42" (86.7 mm) 1.50" (38.1 mm) 1/2" NPTF 3/4" NPT / NPTF Brass