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the one on e bay has threads in them to tap into a pipe the others have a rubber piece that goes on them The rubber piece keeps it from leaking water around it

the shipping on the nipples are very high. I ordered three an the extra rubbers that go around then and also the drip cups in case I want to use a large pipe about 8.00$ for shipping. When I got them they had a piece of some kind of board in the bottom of a large box that really weighed a lot ...