The Wavin OsmaS PP Extension WT 4" (WC404W) is a premium 110 mm soil and waste straight extension connector designed for robust, reliable drainage installations. Made from durable polypropylene with an integrated sealing gasket, this white OsmaSoil pan connector extension ensures secure push‑fit connections between WC outlets and soil pipework, compatible with cast iron, plastic or clay systems. Ideal for trade plumbers and DIY bathroom plumbing projects, this extension piece simplifies installation and delivers leak‑resistant performance on new builds, refurbishments and repairs. Compatible with the wider Wavin Osma range, it offers industry‑trusted quality in domestic and commercial drainage systems.