I have plenty of 1/2" yellow polyethylene gas line left over from my run underground to my detached garage. Is it ok to run this inside my garage about 30 ft to my gas heater? Some of it will be exposed and some will be in the walls. Thanks..
I would say no . . . lots of risk of it getting cut / dinged that it might leak. Plus it will actually cost more with the expensive ends.
Just go with black pipe steel. If you've got a long run, put in contractor grade 21 ft stick to clean up the look. This will be cheap, safe and last a lifetime.