Carrier EC31EZ120 Check Valve 321702-401 It features a 1/2-inch NPT

It features a 1/2-inch NPT inlet and a 3/4-inch NPT outlet

Operating at 120V and delivering 120W of consistent thermal energy

45" WC switch instead

This part is a confirmed fit for several series

Carrier EC31EZ120 Check Valve 321702-401 It features a 1/2-inch NPTThe Carrier EC31EZ120 Check Valve is a genuine OEM replacement part specifically engineered for industrial refrigeration and high performance HVAC systems. Designed with a precise spring loaded mechanism, this valve ensures reliable unidirectional flow and prevents damaging backflow in critical liquid or suction line applications. As an HVAC check valve built to exact factory specifications, it provides a seamless drop in replacement for Carrier