The McAlpine WC-F21S is a flexible WC connector designed for use with back-to-wall toilet pans. It has an inlet size of 97-107mm, which means it can fit a range of toilet pan outlet sizes within that range. The flexible nature of the connector allows it to be adjusted to fit the exact position of the toilet outlet, which can be especially useful in situations where the toilet outlet is not in a standard position or alignment. The connector is made from high-quality, durable materials, which ensures that it will last a long time and remain leak-free. Overall, the McAlpine WC-F21S is a reliable and flexible WC connector that is suitable for use in a range of situations where a back-to-wall toilet pan is being installed. ・ Available for 3½"/90mm and 4"/110mm PVC-U and cast iron soil pipe diameters (internal) ・ 97-107mm Inlet suits all pan spigots ・ Independent tests prove conclusively that there is no build-up of sediment in the flex ・ Soft synthetic rubber inlet connection ・ Worm drive hose clip provides a secure and reliable connection to the WC pan spigot prior to the final placement against the wall of furniture