Which component is used as the installation location for a piercing-type access valve on a small appliance?

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Piercing-type access valves are installed on the process stub because this small, dedicated service point is built specifically for accessing the refrigerant in a small appliance during recovery. The process stub is a short piece of tubing exposed on the exterior of the appliance, designed to be pierced by the valve so you can connect your recovery equipment without opening any other part of the system.

Relief valves are safety vents for overpressure, not access points for recovery. A suction service valve is used to isolate or service the suction line, not the designated piercing access. A vent port is for releasing refrigerant gas under controlled conditions, but it is not the location used for piercing-type access.