Drewg. I bought mine from an aquarium bit in a Garden centre they normally keep all sort of sizes and the smaller tube you can sometimes dip the ends in hot water and sweat them on. Just a thought. Em
If you don't have a local supplier & need to order online, these are helpful
https://www.carbuilder.com/uk/windscreen-washer-tubing-plastic-t-18-and-316
