You can get flex hose UL rated for propane from Amazon, didn't mention above but you have to use crimped or flared fittings only - no barbed fittings with hose clamps. You can also use copper tubing with flared fittings. Remember if you use flex hose it must be one piece - with no cutting of the factory installed ends (roll up the excess somewhere it won't cause a problem)Les. Where can you get an approved line? Next step in my propane stove refit. Figure I need 18 feet to run from stern to behind stove.
Les