800-641 Line Splice Connector. This 800-641 line splicer for 3/8" aluminum lines. This connector/coupler cuts out the "leak" portion of the line by touching the leak point. Made of high-quality CNC Billet Aluminum and anodized coating, it has anti-corrosion and anti-rust properties with an unparalleled service life and excellent durability, providing worry-free repair services.