Types L and K Copper Tubing99% pure copper. Annealed for ready bending. I.D. measurements apply to types L and K tubing. Type L: Heavy wall for general plumbing and heating purposes. Made in U.S.A. at Mueller´s world class copper mills. Sizes stocked in warehouse:1/4" I.D., 60´ coil 3/8" I.D., 60´ coil 1/2" I.D., 60´ coil 3/4" I.D., 60´ coilType K: Extra heavy wall for underground service and general plumbing and heating purposes. Sizes stocked in warehouse:3/8" I.D., 60´ coil1/2" I.D., 60´ coil 3/4" I.D., 60´ or 100´ coil1" I.D., 60´ coil or 100´ coil
