York S1 029 19387 038 Orifice 321894 708 11x11x11 inches) ensure seamless alignment 11x11x11 inches) ensure seamless alignment with factory mounting points Advanced Protection: Features an internal thermostat motor protection and IP54 rated terminal box with cable gland for enhanced field reliability the S1 029 19387 038 is essential for restoring the design flow rate of York air conditioning units and heat pumps after a restriction is detected ensure the orifice is seated correctly within the distributor assembly to allow for unobstructed flow and proper bypass during heating cycles if used in a heat pump application