Gas inlet/outlet through 2 tubes with ball valves - technical clarification requ

The picture may be different from the article and can include supply, which is not in the standard scope.

Gas inlet/outlet through 2 tubes with ball valves - technical clarification required for combination with other options
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WEEE obligation: No
Paraffin oven oven UN160pa, 161l, 20-80°C Paraffin oven UN160pa, natural convection, with...