PVC Plug for Sink 2 Pack Black Diameter 42 mm to 38 mm Top on Bottom Includes 1 x 30 cm Plug Chain Drain Plug for 1 1/2 Inch Valve Top : Amazon.co.uk: Home & Kitchen
McAlpine Black Plastic Backnut Basin Waste with Stainless Steel Flange Black PVC with Triangle Plug BSW12T
Kitchen Sink Plug Chain 15 Inch Long With 2 x Triangle Link Pieces | eBay