The Central Degassing Valves change the way the hydrogen gas vents into the atmosphere during the
charge cycle. It expels the gas through the filter (flame arrestor) and then
sends the filtered air through the return tubing and away from the battery depending on the battery type.
There is a bayonet degassing valve (part #B51220), a push-in degassing valve (part # 151210) and an encapsulated
degassing valve (part # B51000GCG).
The filter EX (part# 09FEX1) works in conjunction with the central degassing
valve to filter the hydrogen gas. It is used to avoid arcing on the batteries
or inside the cells. It is proven and fail-safe.