... down to the lower lever system, linkage, open the exhaust valve, gas leak, released the results due to the pressure reducing valve ... , then again, the complete piping and equipment system of automatic exhaust process.2,constitution Brass valve,valve cap,the float is ... 1/2 '' to 3/4 '' complement core . (3),If not exhaust,tighten the next body,to remove dirt and re-install ...