Oil Resistant Straight Rubber Hose Reducer (22mm to 19mm) for Provent Pro Vent | eBay
45-38mm ID Reducer
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