I will be installing quite a bit of copper tubing. Probably a 60' run of 3/8" hi-pressure run and several normal pressure 1/2" runs in theneighborhood of 50-75 feet and possibly a 3/4" run of 25 feet or so (large tankless water heater). Wondering if there is a lower cost do-it-yourself alternative to copper tubing. I installed underground plastic tube supplied by LPG dealer and they came out to install the fittings and terminate it to the tank and regulator. They way I get it the plastic fitting is a proprietary system that requires some special connectors, tools and training. Even if this stuff was adequate for indoors use, by the time I paid for the tube, fittings and the service man to install all the connectors I'm back at the price of copper.