Dust Extractor Hose Fitting Reducer 100/63 OD 100mm to 63mm, ID 93mm to 58mm extraction reducing cone adaptor adapter : Amazon.co.uk: DIY & Tools
Brass Pipe Fittings, Water Hose Adapter, G 1/2 Female to G 3/8 Male Reducer Adapter, Compression Fitting for Kitchen Bathroom Faucet, Pipe Connector with Rubber Washer,(2 Pack) : Amazon.co.uk: DIY & Tools
Straight Reducer Barbed Plastic Hose Connector - The Hose Experts