The McAlpine Boss Pipe For WC Pan Connectors in white is a straight adapter made from durable polypropylene material. This 4" diameter item with an interior diameter of 3½". Designed for connecting to a WC pan, this corrosion-resistant and rust-resistant adapter from McAlpine is suitable for toilet waste pipe installations. Manufactured in the United Kingdom, this adapter comes with a blanking cap.
eBay