Image Image NK-Series Japanese Pneumatic Female Threaded Plug Markets Maintenance Repair Operations (MRO) Product Options Part Number Length Maximum OD Body Size Thread Thread Size Pipe Thread Material NK2BF2 1.39" 0.52" 1/4" BSPP 1/4" BSPP / BSPT Steel NK2F2 1.39" 0.52" 1/4" NPT 1/4" NPT / NPTF Steel