The McAlpine WC-F18S is a flexible WC (water closet) connector used to connect the toilet pan to the waste pipe. The connector has an inlet diameter of 97-107mm and an outlet diameter of 3½"/90mm, making it suitable for a range of toilet pan sizes and waste pipe configurations. The flexible design of the connector allows for some movement and adjustment, making it easier to install and ensuring a secure and leak-free connection. The connector is made from a high-quality, durable material that is resistant to chemicals and UV light, ensuring long-lasting performance.