GENOVA 81131 3X1-1/2 ABS Sanitary TEE, 3" x 3" x 1-1/2"

I have a 2013 Redwood 5th wheel. I bought it a year ago. About a month after I got it started have problems with the tank being clogged and would drain. I also couldn't get one of my valves to close all the way. I am Brandon from tank pro come out and clean my tanks. He cleared the clog. 3 months later clogged again. Called Brandon again to clean the tanks so that I could dive in and really fix it this time. After removing all the piping and valves I find out in was the knockout from when the factory put in the vent pipe it was lodged and kept the valve from closing. Exactly what I needed to tie the black and grey tanks together

My local Lowes, Home Depot, and Ace don't care a lot of ABS and definitely not this piece. I love being able to order plumbing supplies like this without paying a significant premium. This worked perfectly!

it is what it is