The Viper refrigeration system contains pressure transducers for monitoring refrigeration operating pressures without attaching external gauges. The low side transducer is located on the refrigeration line (copper tubing) outlet side of the freeze barrels. The high side transducer is located on the refrigeration line (copper tubing) before the liquid line solenoid and the AEV at the inlet to the freeze barrels. The low side transducer marked with a green ban has a range of 0 to 300psi and the high side transducer (no ban) has a range of 0 to 500 psi. The transducers are not interchangeable.