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There is a PVC pipe that the old one is screwed on to, unscrew the old one and the new one came with an adapter to fit a couple pipe sizes and I think I used the adapter. When you look under your sink there should be a drain pipe that goes up with the vent attached at the top. Mine had gotten gunk in it and the valve wasn't working allowing odors to enter the RV. It was worse when we had the top vent or front windows open while underway. You rig is different than mine so vents may be in another place or I guess even not there at all.
Good luck!
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This post is opinion based on experience. 
2015 Hurricane 27K
2013 Sea Ray 220SD
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