RV Pipe Vent 1.5"

I needed a unique fitting for a vent under the shower on my Class B Van conversion. If you look at the installed picture you will see the “P” trap just to the right of the vent fitting. I wanted to get as close to the bottom of the van floor as I could so the vent holes are facing up and have about ¼" clearance to draw air. The fitting fits into a 1-½" tubing as shown.