is it legal to run liquidtight flexible metal conduit as the raceway to feed a motor that sits directly next to a propane tank?
What is the area classification? If it is Class 1 Div 2 then sealtight is ok. If it is Class 1 Div 1 then explosion proof flex is required at about $100.00 per for 1/2".
Only if the area is classified as Class I, Div. II