This item is currently out of stock.
A stuck or leaking waste valve is one of the messier RV repairs, and Valterra's T58 gives you a way around pulling the old one apart. It twists directly onto your existing 3" waste valve outlet, so once it's attached you can leave the broken valve open and operate this one instead.
A practical fix when a waste valve seizes up or starts leaking and a full plumbing repair isn't in the cards right now.