Detailed Question
              The most often asked for thread sizes?
Brass Adapter (on One Way Valve): 1/4 inch NPT-O2
Emergency Valve Outlet: 9/16 -18 inch UNF 2A (USA “standard scuba”)
Small LP Ports 3/8 inch-24 UNF 2B
Large LP Ports 1/2 inch -20 UNF 2A
Product
          Kirby Morgan Diamond®
          Kirby Morgan 97
          SuperLite 17B
          SuperLite 27 
          SuperLite 17C
          Kirby Morgan 47
          Kirby Morgan 77
          Kirby Morgan 37
          Kirby Morgan 37SS
          Kirby Morgan 57
          BandMask® 28
          BandMask® 18
          M-48 SuperMask
          M-48 MOD-1
          First Stage w/Balanced Second Stage Regulator Assembly
          Balanced Scuba Regulator
          SuperFlow First Stage Regulator
          Metal SuperFlow® Scuba Regulator
          Scuba Regulators
          SuperFlow Scuba Nonadjustable Regulator (Octopus)
          Plastic SuperFlow® Scuba Regulator
          SuperFlow Scuba Regulator Assembly w/Plastic Adjustable 2nd Stage
          SuperFlow Scuba Regulator Assembly w/Metal Adjustable 2nd Stage
          SuperFlow 450 Regulator
          455 Balanced Regulator
          SuperFlow® 350 Regulator
          SuperFlow® Regulator
          The REX® Regulator
          Full Face Mask Regulators
          Helmet & Mask Regulators
          EXO® 26 Original
          EXO® BR