Image Image SHD-Series Schrader Pneumatic Male Threaded Plug Markets Chemical Processing, Construction, Maintenance Repair Operations (MRO), Mining Product Options Part Number Length Maximum OD Body Size Thread Thread Size Pipe Thread Material SHD2M1 1.54" 0.79" 1/4" NPT 1/8" NPT / NPTF Steel SHD2M2 1.72" 0.79" 1/4" NPT 1/4" NPT / NPTF Steel SHD4M3 1.81" 1.01" 1/2" NPT 3/8" NPT / NPTF Steel SHD4M4 1.87" 1.01" 1/2" NPT 1/2" NPT / NPTF Steel