He was talking about the boiler drain valve at the side and bott

来源: 于 2015-02-03 15:48:48 [旧帖] [给我悄悄话] 本文已被阅读：次

The top valve in your picture is the flushing valve I was talking about. Professional way is screw a garden hose to the valve and close the valve below the flushing valve to flush out the air bubbles with water.