This orifice (also referred to as a piston) is installed in an evaporator coil when the coil has a different tonnage rating than the condenser tonnage rating. Installation takes about 5 minutes, and consists of replacing the orifice already inside the larger tonnage coil. We have an online picture step-by-step guide which shows how to do this.

Description:

Goodman flow check piston kit; Orifice opening of 0.078"