64. The EPA requires that all appliances must be equipped with a service aperture or other device that is used when adding or removing refrigerant from the appliance. For small appliances, this service port typically is:

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a straight piece of tubing, called a process tube, that is entered using a piercing access valve.

64. The EPA requires that all appliances must be equipped with a service aperture or other device that is used when adding or removing refrigerant from the appliance. For small appliances, this service port typically is:

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