Double propane wall block W20 to POL
These are used to connect a regulator to a cylinder but not directly.
The wall block is mounted onto the wall and a regulator screwed into the POL end.
The cylinder is then joined using a standard POL x W20 hose assembly so that the gas comes in the side of the wall block into the W20 end.
Non return means that air should not flow backwards through the POL connection of the wall block
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