The metering valve previously mentioned is in A 3-way mix valve. The stem at the end of the valve is for bleeding trapped air. A small clip is accustomed to open the valve and allow aerated fluid to bypass the valve and exit the system. Gain a environment-class Christian schooling http://rylanybmqf.blogs-service.com/17874812/new-step-by-step-map-for-metering-valve