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When we moved RVs, from Windy to Roy, we only took one of our major mods with us: The Composting Toilet. When I told the service manager at Fleetwood Headquarters that I could install the toilet he said jokingly “I saw your last install video, I think we better do it for you!” Since you don’t get to see another one of my handy man videos I thought I should at least share how the composting toilet install in our Excursion turned out.

The greatest benefit of installing a composting toilet is not having to deal with a black tank; but what do you do with that unused tank that’s taking up valuable space in the RV? We thought about adding another freshwater tank, or removing the black tank and adding a larger grey water tank, or even adding a PVC pipe with a shut-off valve between the black and grey to combine the tanks; but the idea of me (Jason) removing or replacing anything of this magnitude in the RV sounds like a horrible idea.  So I gave up…until we were having dinner one night with our friends the RV Geeks and they recommended the most ridiculously simple, zero install idea of how we could combine the RV black and grey tanks.

Before attempting to combine your black and grey RV waste tanks It is important to understand the capacity of your specific RV tanks.

RV’s come in all sorts of shapes and sizes.  They are broken into 4 main classes.  Knowing the different options available is the first step to deciding which class best suits your travel needs.  Here is the breakdown:

  • Class A: Constructed on a custom chassis these RV’s are typically the most ‘home-like’.  They offer upscale amenities like central heating/cooling, entertainment centers, bathrooms, and lots of exterior ‘basement’ storage.  Most offer one or more slide-outs to give you a little more breathing room inside the coach when you’re parked.  Class A motorhomes are often the largest and most expensive RV’s on the road, and some larger models require a special license to operate.