What causes these potential relays to fail

these part numbers refer to the same physical conversion kit

Universal Refrigerant Compatibility: Developed for use with R22

Manual Reset Security: Requires a physical inspection by a technician before the unit can be placed back into service

Chevron Pneumatic Tubing 1063777 Tubing Els PW 17895 What causes these potential relaysAs an HVAC technician, you know that the reliability of a pneumatic control system depends on the quality of its air lines. The Chevron Pneumatic Tubing 1063777 is a trade grade twin pneumatic tubing solution designed specifically for demanding commercial environments. Supplied in a 250 foot roll, this 1 4" OD polymer tubing offers the flexibility needed for tight bends in control panels without risking kinks or structural fatigue. As a Plenum Rated