The Raypak 003898F is a 3/4" millivolt pool heater combination valve designed for natural gas systems. This gas valve regulates the flow of natural gas to the pool heater, ensuring efficient and reliable operation. Its millivolt system operates without external power, making it ideal for pool heating applications where electrical connections might be limited or unavailable. The valve'... https://www.usapoolshop.com/003898f-raypak-3-4-mv-slow-open-natural-gas-valve