Stainless Steel Fittings CATEGORY A :Hose Adaptors, Elbows, Tees, closing plugs, 'O' ring face sealed Adaptors etc CATEGORY B: Hose fittings crimping styles (permanent attachment ) and re usable styles (field attachable ) SIZE RANGE:1/4" TO 2".BSP, NPT. UNF ORFS AND METRIC.