Our 1993 Barth has an old gravity, Land/Sea model #511 toilet that the vacuum break was leaking and could not be repaired. I found a place that has all the parts for her(Enviromental Marine Services), ordered the part and installed it without any problems.

Good deal.

We did away with our traditional rv toilet and installed a waterless Trelino toilet . It's great not having a black tank anymore . Now we have two grey tanks .

https://mytrelino.com/products...-l-composting-toilet