INSTALLATION SIMPLIFIED: The design of the 18" extension pipe is to make installation easier and to conceal the plumbing behind the wall. SECURE CONNECTION: The pipe has an inner gasket which connects to the rear spigot of your Saniflo toilet, creating a sealed connection which will prohibit leaks. DESIGN IN MIND: The extension pipe comes with a paintable, decorative trim to fit in with your current bathroom décor. This special design feature further adds to the seamless design. TECHNICAL SPECIFICATIONS: This pipe is suitable to be used with the Saniaccess3, Saniplus, Sanibest Pro & Saniaccess2 systems. The overall length of the pipe is 18 inches and 4 inches in diameter with 5 inches being the largest at the bell housing. 4 YEAR WARRANTY: All of Saniflo's products have a 2 year warranty with purchase, and an additional 2 years is added with registration. Our warranty program can offer peace of mind, should a problem arise.