Eastman 0436312 Water-Flex Corrugated Copper Water Heater Connector with Nitrile Rubber Sealing Washer, 3/4-Inch FIP X 3/4-Inch PEX, 12-Inch Length DIMENSIONS: 12-Inch Line Length, Nut x PEX: 3/4-Inch FIP X 3/4-Inch PEX for SDR9 PEX tubing MATERIAL: Seamless copper pipe with solid brass Hex Hut is designed to withstand corrosion and offers long-lasting performance DESIGN: Deep corrugations provide structural support against crushing, kinking and cracking CONTENTS: External dielectric sleeve and nitrile rubber sealing washer meets NSF standards FEATURES: Manufactured from a Full 7/8" OD (Outside Diameter) Tube