How do I vent to the existing black water tank vent?

The OGO Origin comes with a hose that has a black hose end fitting. This black hose end fits perfect on an 1-1/4" PVC pipe. Depending on your build, your black water tank vent could be a varying size. You'd have to find the best way possible for your build to get from an 1-1/4" PVC to Tee into whatever size PVC of your black water tank vent.