Hi All, I am a complete NOOB when it comes to plumbing so please bear with me and use baby steps lol. I'm trying to plumb in a dishwasher but I am having a problem with the waste hose. The hose is pre-fitted to the dishwasher so I can't remove it. The hole at the end of the waste hose is 18mm but the copper pipe I need to attach it to is 22mm. Is there any kind of adapter that I can use to connect the 18mm end of the waste hose into the 22mm end of the copper pipe. Unfortunately I can't change the fittings or the waste hose. I have attached a photo of what I am working with, its all original fittings that are there I have not changed anything.