1999 3255 water tank drain location?

[willie91]

Like the subject says I can't find the drain for the water tank on my Montana! I have 3 petcock types hanging down 1 by the back right corner and 2 on the front left that drain the hot water.

[Art-n-Marge]

The fresh water inlets on the side are typically on the opposite of the drain since most tanks fit sideways between a frame. If the fresh water inlets are on the driver side rear of your Monty, the chances are high the petcock on the opposite rear is the drain for the fresh water tank.

You mentioned there are 2 near the front left (front driver side). Could one be for hot and one for cold to assist with winterizing?

That's the best I can suggest.

[bncinwv]

I believe Art is correct. You should have a hot and cold water low point drain to drain most of the piping system. The single stand alone drain should be your fresh water drain. To drain the hot water tank itself, you need to remove the anode rod at the bottom of the tank, although for your model year it may be possible that there is a hot water drain, newer models are not equipped as such. If the stand alone drain is indeed for the hot water tank, then chances are you will have to get under the rig (as Art says) in the vicinity of the fresh water tank fill and look for the fresh water drain. On our model, I actually have to crawl under the rig to drain the fresh water tank, others have installed extensions and brought the drains to the side of their rigs to allow for easy access. Keep in mind that the low point drains must be supplemented with air or RV antifreeze for winterizing purposes as they will not purge the system completely of water. Hope this helps.
Bingo

[willie91]

The single one in the back is for draining the pipes in the bathroom, the other 2 are up front under the hot water tank area. The one in nthe back is right below the tank fill.

[Art-n-Marge]

At the tank fill can you look underneath and remove any underside covers and look for another drain? My '06 Monty's fresh water drain is pretty obvious and drops through a hole in the underside cover, but the 1999 Monty might be different. For example, Keystone might have come up with an idea to install underside covers and not considered a drain until a later year (after customers complained). Or maybe you drain shares this functions.

Fill up the fresh water tank with a few gallons of water and with the pump off and no other faucets on, open the rear petcock and seeing if water flows freely. If it does that may also be the drain for the fresh water tank as well. If it does not, then the drain is elsewhere or horrors, there isn't one?

You can also try contacting Keystone and asking their support center. I think the Keystone contact numbers are accessible via the "Home" link on this Forum, otherwise I hope another MOCer can provide it.