Watts Water Heater Supply Line Braided, Stainless Steel 3/4 " Fip X 3/4 " Fip X 36 " Pvc Pvc Nitrile "WATTS" WATER HEATER SUPPLY LINE 3/4"FIP x 3/4"FIP x 36". Flexible braided stainless steel. core is PVC tubing over braided with polyester yarn and another layer of PVC for strength. Inner core is over braided with stainless steel.