Sorry,tavernhead is the device that plugs into the keg Budweiser-American stankey Heineken European stankey micromatic gives them letter designations and might refer to them as keg couplers thomas valve is a small plastic or rubber piece that goes in the tavern head beneath the gas connection hex nut on the side of the tavernhead to ensure you dont get beer into your air line and regulator. I used to work for a Bud distributor and I was taught tha if knob on gas bottle not turned fully on or fully off it could leak.
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