Hi, I need to extend my dishwasher drain hose by 3 metres. The longest extension available off the shelf seems to be 2.5 metres. So, I am going to buy two 1.5 metre extensions and join them together. Obviously I need to join them and also join the extension to the original hose, but all of the little serrated spigot type connectors I have seen are 19mm, whereas the hoses are 22mm, and the connection is certianly not tight enough to be watertight. Are 22mm connectors available does anyone know please. Or is there another was to extend a drain hose. Thanks!