How is your project going? I guess no one saw your post. If I'm not sure of the size, I'll cut off an inch of a hose to take in to the store and compare.That way you can reconnect the old plumbing while you buy new. On the fittings, most plumbing stores will let you take an assortment of fittings (that you've paid for :lol: ) so that you are sure to have the right sizes, and then return the ones you can't use with the receipt. The tubing though is cut off a longer roll, so won't likely be returnable.