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Hello & thanks for looking at my post. I have a 1989 Toyota Sunrader & am hoping to find links for info re: fresh, grey & black water tank maintenance. I've seen some info out there, but without pics it's hard to know how & if it applies to my Sunny. I only see/know of 2 drain outlets, one under my rear bumper which I assume is the grey water tank, and one on the driver side under my bathroom which I'm assuming is the black water tank. When it comes time for "winterizing" I am unclear how to make sure all of the lines are completely void of any remaining water. Also, I'm not even sure how to fill my fresh water tank - I thought a water hose would just screw onto the potable water inlet but it doesn't look like it will attach properly ... am I supposed to use a funnel? Or do I buy a water pressure regulator ($8 at Walmart) as I saw in another post & does that attach to the opening? And I'm unclear what the opening to the left of it is with a wire mesh cover over it, which I can't get off -- is it a vent? It will turn in both directions but it doesn't unscrew. How do/should I clean it? Also, is it true that white vinegar (1/4 cup per 5 gallons?) is an equally effective way to sanitize your FW system? If so I think I'd prefer that over the bleach method, given it would probably have less of a residual effect after flushing out. I've included pics of my fresh water inlet (there's a little tiny hole above it & what looks like maybe a rubber plug that can fit inside the tiny hole,attached to the cap cover -- what's that for?), the 2 drains I can see, my water tank/system inside under passenger back bench, the water heater (how do I drain that?), & water heater switch. As far as the water heater, that operates on propane only correct? And is turned on/off by the electric switch under the kitchen sink -- it's electric-ignited via 12V auxillary battery, not pilot light yes? Ok that was a lot of rambling & not well-organized, my apologies. I appreciate all who have responded to my previous questions and I thank you for your patience. This is all totally new to me. Thanks, Todd