The copyright EF33CW189 is a 2-stage natural gas valve designed for precise control of gas flow in HVAC equipment. Made of steel for durability, it features a 3/4-inch NPT connection and operates on a wide range of frequencies (50/60 Hz) for compatibility with most systems. This valve regulates gas pressure at a steady 1/2 psi, ensuring optimal performance and combustion efficiency wi... https://www.partshnc.com/24v-35-wc-nat-34-gas-valve-30