Caleffi Valve Fitting, For Use With: 127 Series 1/2 in C FlowCal™ Compact Dynamic Balancing Valve, FlowCal+™ Dynamic Balancing Valve and 132 Series QuickSetter™ Balancing Valve, 520 Series TankMixer™ Mixing Valve, 521 Series MixCal™ Adjustable Thermostatic and Pressure Balanced Mixing Valve, 5350 Series AutoFill™ Automatic Filling Valve, 535H Series 3/4 in Pressure Reducing Valve, 5517 Series DISCAL® Air Separators for Vertical or Horizontal Pipes, 644 Series Ball Valve, 676 Series Zone Valve and Z2, Z3 Series Zone Valve