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Seamless corrugated 18" flexible copper water connectors. Complies with no-lead laws. 3/4" FIP x 3/4" FIP. Internal dielectric sleeve effectively separates dissimilar metals within the waterway to prevent galvanic and electrolytic corrosion. Nitrile rubber washer is more resilient than PEX and easier to install on rough nipple surfaces. A greater number of thread to thread contact provides a better seal to lined nipples. Design-certified and manufactured in accordance with ANSI/ASME A112.18.6, ANSI /NSF-61. corrugated copper water heater connector is the trusted choice when installing your water heater. These connectors are manufactured from a full 7/8 in. O.D. tube meeting industry and NSF standards. The brass nuts at both ends of the connector certify firm connection.