Review on High-Quality Oatey 39012 1.5 in. NPT ABS in-Line Vent in Black - Ultimate Plumbing Solution! by Dan Germain

It replaced a J&B air valve in my 2016 Forest River trailer. Sinks in the bathroom, and some models require a larger clearance above the siphon. Luckily, this replacement has a smaller footprint, making it easier to install in such tight spaces. In the photos the smaller of this Oatley is next to the old J&B which it replaced. I couldn't figure out where those shitty flies came from, and one day I found out how bad gray tanks can smell. I'm telling you, gray tanks can actually smell worse than black tanks. .Who would have thought that? Blessed are all the kind souls who post repair videos through the tube. Looks like the old valve got stuck (with bugs) and the sewer flies got through. Now I have no smell or flies and the drains seem to be running fast now. Will update this review if/when it needs replacing.