Trane VAL19558 Reversing Valve R-407C What is the difference between

What is the difference between the P499 and the legacy P399 series

The 1/2" ODF (Outside Diameter Female) connection accepts 1/2" tubing inside the fitting

this differential pressure switch provides the mechanical consistency required for modern Sterling heating equipment

Operating on a 55 to 85

Trane VAL19558 Reversing Valve R-407C What is the difference betweenThe Trane VAL19558 is a heavy duty 3 4" OD Reversing Valve designed for precise refrigerant flow management in heat pump systems. Built to withstand the rigorous pressure differentials found in industrial and residential HVACR applications, this VAL19558 reversing valve is a critical pilot operated component that facilitates seamless transitions between heating and cooling cycles. This unit is provided as a valve body less coil, offering technicians