Image Image M-Series ARO Pneumatic Female Threaded Plug Markets Chemical Processing, Construction, Maintenance Repair Operations (MRO), Mining, Transportation Product Options Part Number Length Maximum OD Body Size Thread Thread Size Pipe Thread Material M2F2 1.57" 0.79" 1/4" NPTF 1/4" NPT / NPTF Steel M2F2-B 1.57" 0.79" 1/4" NPTF 1/4" NPT / NPTF Brass M2F3 1.57" 1.01" 1/4" NPTF 3/8" NPT / NPTF Steel M3F3 1.82" 1.01" 3/8" NPTF 3/8" NPT / NPTF Steel