For small appliances, what is typically the service port for refrigerant addition or removal?

In small appliances, the service port for refrigerant addition or removal is commonly a straight piece of tubing known as a Process Tube. This type of inlet allows for a direct connection of service tools, ensuring secure and efficient access to the system for maintenance tasks.

The Process Tube is specifically designed to accommodate pressure readings and refrigerant flows without the risk of leakage that could be encountered with other methods. This design is crucial for safely managing refrigerant levels and performing repairs, as it directly interfaces with the refrigeration system.

The other options, while they may serve different functions, do not provide the necessary connectivity for refrigerant handling. A screw cap may be used to cover a port but does not function as a service port itself. A pressure relief valve is designed to prevent excessive pressure buildup in systems and does not serve as a point for refrigerant addition or removal. A detachable hose assembly is typically part of the service equipment used but does not represent the service port itself.