A-220-1021-AI High Pressure Switch w/ HNBR O-RingOne New Aftermarket Replacement High Pressure Binary Switch with HNBR O Ring for Semi Truck Auxiliary Power Units (APU) This aftermarket replacement high pressure binary switch is a key component in the A C refrigerant circuit of semi truck Auxiliary Power Units (APUs), including RigMaster APU systems. The switch monitors refrigerant pressure and protects the A C compressor by opening at high pressure and closing at low pressure thresholds. The
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