So we are lucky enough to have sewers at our house. About a foot away from our house is a metal sewer vent that looks like the picture below. It's just a metal pipe coming from the ground with a cap on it. It is not threaded at all.
Let's say a got a macerator pump for my TT. Could I hook it up and then run a garden hose down the vent to empty my tanks?
Might not make the city sewer administrators to happy. But--when we built our new house we had the plumbing fixed so I have a dump port that goes into the city sewer. They approved the plumbing so I guess in our case it was ok.
it may not be a "sewer vent" but the sewer clean out access point. Most houses with access to sewer lines have a clean out port outside the house. If that is what it is, yes it can be used as a dump. That's exactly what we do.
2011 Keystone Outback 295RE 2004 14' bikehauler with full living quarters 2015.5 Denali 4x4 CC/SB Duramax/Allison 2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!
Sewer or septic tanks? I assume you are certain this goes to one or the other. If so, then yes, just be careful you don't over load a septic system if your RV holding tanks are large. You can run some water down the vent with a fresh water hose to confirm their is no blockage that would cause a back up. You really don't want that!