i bought 1 inch inside diameter pex-al-pex tubing 200psi rating 100 foot roll for 100 dollars.from outdoor furnace supply free shipping i did my shop with the entire roll and 4 outlets for 400 dollars with three flexzila hoses 2 35 foot and 1 50 foot,1 outlet dedicated to the tire machine with a ball valve.very easy to install and easy to bend.1 inch id adds volume.it's all i'll ever use. the pex company says they use it for air in there buildings

