... liquid level down, goes down, its down to the lower lever system, linkage, open the exhaust valve, gas leak, released the results ... emission collection, then again, the complete piping and equipment system of automatic exhaust process.2,constitution Brass valve,valve cap,the float ... need to install in 3/4 '' diameter of pipe, simply adding 1/2 '' to 3/4 '' complement core . (3),If not exhaust,tighten ...