Pool heater repair. Tested 3/4” gas feed going into pool heater. Sniffer detected a leak going into the gas valve of the pool heater. I undid the piping from the union and repiped, and a leak was still detected after proper installation. Pulled apart again and pulled the gas valve from the unit, and found that the aluminum block of the gas valve had a crack in it where the 3/4” nipple pipes into it. Unit is a swim pro (Hayward, I believe), and the gas valve model number is in pics. Installed new universal gas valve on Hayward pool heater. Everything fired up safely and works properly