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Getting ready to use my grey water bypass for the first time this next trip and I'm attempting to figure out how to use it now vs. when we get there. Am I to understand that all I need to do is close the manual valve and then open the main air operated valve? Scared to just try it as I always assumed there there was grey/black waste up directly against that air valve all the time and I'd therefore have a mess with whatever grey/black was already that far. Hope that all made sense?

Edit: I couldn't wait and used garbage bag for the just in case i was wrong. Looks like all I need to do is close manual valve and then open air valve and all is well with the world and grey flows. Man this is going to make boondocking SO MUCH BETTER in that we have access to fresh water to refill tank so no more Navy showers on the next trip.