We have one of these valves factory installed in our outdoor kitchen. Starting last fall we could smell odors, but winterized it and forgot about it until this spring. When we started to use the trailer again this year the odors returned. I just figured out last weekend that it is a result of the Hepvo valve not closing properly. We don't use the outdoor kitchen sink very often, and have never put anything but water into it. I now have to replace the valve with a new one in hopes that it will last longer. Their website says that they carry a three year warranty, but has no contact information or warranty claim procedures. If I could eliminate this valve and use a regular P-trap I would, unfortunately there isn't enough space under the sink to do so.