Winterization Discovery

[3'senough]

So today I had the sad job of winterizing our unit for the winter due to a lot of reasons. In doing so I discovered an alarming amount of water being left behind in my FW tank after the low point stopped flowing.

I must have pumped out via the pump 15+ gallons it seemed. It went for a good 10 minutes through my outdoor shower. Last year I drained the low point and went right to the winterization valve and this year I just happened to screw up and go from the tank first. To my surprise water was pumping out of my shower head.

So for all you out there doing your own winterization do yourself a favor if you haven't already and hit the pump to see that the tank is in fact empty. How my tank did not crack last year is a mystery!

[SmokerBill]

Did you drain through the low point drains or the tank drains? Low point drains empty the plumbing. Tank drains are mounted at the bottom of the tanks. If you did use the tank drains, maybe next time you could park on an incline, with the trailer tipping towards the drain side. My tank drains empty my tanks almost completely.

[Gone campin]

Like Bill said, you have to use the tank drain, not low point drains. Mine is in the very bottom (they all should be) so they empty it out pretty good.

[3'senough]

Dropped all 4 low points, blew it out and inclined a few inches above level and still no flow through the tank low drain point. The lines were 100% dry.

To have the amount I had was alarming. My point is just to alert others to not take the drain for face value as you may still have fresh water in the tank even if the drain is not flowing and to double check.

[CKinsella]

Just curious, how many low point drains did your rig have? My 2004 class C has four. I figure one is the cold water line, another the hot water line, the third should be the fresh water tank drain.
I have no idea what the fourth drain is for.
Does anyone have a clue?

[Seann45]

The low point drains are for the water lines... there is a separate drain for the tank

[ALJO]

The FW Tank never drains completely. What's left has enough room for expansion.
The FW Tank drain hose might have a sag in it. To solve it just put 5/8 or 3/4 PVC around the hose.