Low Pressure Brass Ball Valves Recommended Operating Pressure Between 200 Kpa And 1500 Kpa. Nominal Pressure 1.6 Mpa. Replacement Arm Code 333760 025. Brass Ball: 332 B250 Or 332 B300. Stainless Steel Ball: 332 Y200 Or 332 Y250. Polyurethane Ball: 332 C3550. Arm Size 12mm.