HHO Generator cold weather bubbler siphoning issue.

On a cold Minnesota morning I noticed coolant siphoned from my safety bubbler in my new HHO generator system. I have fixed this small problem with some simple off the shelf parts from a local plumbing supply store which are made from PVC. I purchased a 3/4" PVC one way check valve, two reducers, and 3/8" barb x 1/2" pipe thread adapters. This seems to have fixed the problem. The gas pressure from the HHO gen is enough to open the one-way valve, and I can not blow back through the valve as it is spring loaded closed.

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