The suggestion to empty the tank by placing it on its side and opening the valve is a bit flawed for 2 reasons.
1. The valve itself has a spring loaded “seal” that is activated when screwing in the regulator hose. So, nothing is going to come out of the tank without that spring loaded seal is depressed .
2. These tanks have a safety valve inside which is part of the valve . I can describe it as sort of a “float” shut off.
When tipping the tank on its side , that safety “float” shuts off the flow and prevents the fuel from coming out of the valve .
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