IMHO most people with flush valves like this do not keep them connected when they are not being used. There is the potential for disaster if something or someone caused water to flow into your black tank with you not being aware of it. Even a slight leak at the spigot could, over time, cause your tank to fill and eventually overflow.
Furthermore, several states have enacted plumbing codes which prohibit simultaneous connection of hoses to both drinking water and sewers for fear of cross contamination. Even though the check valve is supposed to prevent that from happening, I have encountered RV parks that are sensitive to the subject of having their water system in any way connected to a black water tank. Leaving the hose connected all the time is a "flag" which I prefer not to raise.
I leave my flushing hose connected to a "Y" adapter at the spigot and find it handy for watering plants, etc. I normally only need to flush the black tank every 5-6 days and I don't think it's that big a deal to connect to the San-T-Flush fitting when I do.
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Joel (AKA docj)--
RV Technology Specialist
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