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Keystone replaced it but my tech ( who I trust ) said there was no room in the 3750 design to replace mine with another kind, or adapt it! He is always very straight with me. He actually came up with sealing idea... I did it so he would not get in trouble! Frankly I have little hope it will continue to work! Just one of those things... Funny how I even went to our new CamperWorld and got same story! They are called anti siphon trap vent device (ASTVD). I was told the rubber membrane drys out. It's spring loaded and does not seal completely. Was told on a web site you can use lubricating grease. I like glueing it shut! Probably not a good idea! Lol. Keith mine has a narrow base and was shorter I believe. Some screwy thing with 3750 model. I guess the pipe is right agaist a wall or cabinet. I can get under there to see, due to the size of my fat gut. Incidentally its interferes with seeing my feet etal! So I rely on others! Lol
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