The McAlpine WC-F23SV is a straight flexible WC connector designed for use with 97-107mm inlet and 90mm/3.5 inch outlet waste pipes. It features a 1.25 inch universal vent boss that can be used to connect a vent pipe to the waste system. This allows for improved ventilation and helps to prevent unpleasant odors from entering the bathroom. The connector is made from high-quality, durable materials and is designed for a secure, leak-free connection between the toilet pan and the waste pipe. The flexibility of the connector makes it easy to install in tight spaces or where access is limited, and it can be used for both horizontal and vertical installations.