Giving the keys back to our rental today. We've moved our washing machine out but the drain goes into the U bend under the sink. Need to get some sort of cap/plug/stopper to avoid contents of the kitchen sink emptying into cupboard below.
Any idea of the name of the bit I need to look for? There are threads on the end but originally it was a u bend where you have to cut the end first, so no plug supplied originally.

