A McAlpine 4″/110 mm Drain Connector Soil to Waste Reducer 2″ (DC3‑BL) is a black plastic plumbing fitting used to connect a larger 110 mm (4″) drain or soil pipe to a smaller 2″ waste pipe. It has a finned seal spigot and sealing ring that creates a watertight joint between the drain and the smaller waste pipe, and is typically used for low‑level waste connections in drainage systems. (sydenhams.co.uk)
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