The 18696 is used to couple two sections of tubing or hose that have a 2.54 cm (1.0 in.) inner diameter. For example, the 18696 is often used to couple sections of 7123 hose together. The 18696 is stainless steel, 7.62 cm (3 in.) long, and has a thickness of 1.25 mm (0.049 in.).