Drain for a non overflow sink

: Hello, I just installed an oasis nonoverflow sink with a mowen faucet. The drain leaked after it was put together. I called mowen and they said that I would need to get a drain for a nonoverflow sink which they said they do not make. I would need to get an after market one. That is the problem I cant find one. I was looking for help to find what kind of drain I would need to get and where I could get it. I would like one with a pop -up stopper. Thanks, Melvin McCurleyI dont know of one made with a pop up; Find a piece of plastic pipe or a plastic coupling and saw(cut) it make a spacer or sleeve that will make up the difference you need. use po plug washer on each end and caulk as you put it together.