http://www.parher.com/jic-swivel-fittings/ Set fire gas water heater has two main functions: one is to use it to ignite the main burner; second is to use its uninterrupted heated thermocouple. Thermocouple is a heat can be converted into electrical energy components, installed next to the fire, the heat generated by its current control solenoid valve, open fire in the supply channel, so as to achieve the maintenance supply, continued to ignite the fire purposes. Water heaters used for a period of time, prone to fire and flame failure can not be sustained.