Dometic toilet 311 valve leakig

[Nick and Linda Stratigakis]

Currently on a trip.last night I discovered that the water valve is leaking . Understand I will have to replace the valve and found one in Amazon. My question is how hard is to remove the old one and replace with a new one .seems the kit includes everything I need.

thank you for any guidance or suggestions 

[Galway Girl]

This you tube shows the trick is getting one screw (that's very hard to see on the back) removed before trying to pop out the valve.  See the 2:12 Mark on video...easiest to use a 1/4" socket to remove screw.]\

 

Edited April 29, 2025 by Galway Girl

[Nick and Linda Stratigakis]

Thank you for the recommendation of using a 1/4” socket. It made my work much easier. 

[SNY SD UP]

It appears as though I have some issues with my winterizing skills.  

That said we are chasing leaks, currently, this one out of the back of a Dometic (310/311, does the model number make a difference) for the "Water Valve Kit".

The leak is coming out of the back of the "Water Valve Kit", just a slight dribble, but enough to be worrisome whilst spilling onto the shower floor.
I watched the video provided by Craig and "I can do that!!!" 
I would like to remove the valve and examine it, to see if something on it is cracked or worse yet further up in the toilet.

I am going to see if it can be found locally, if not the AMZN...

[SNY SD UP]

I was able to remove the valve assembly and examined it.  This is before i found the following in a Dometic Manual i had 

"IMPORTANT:
Toilet warranty does not cover freeze-damaged water valve
The Dometic 310 and 320 series toilet warranty expressly excludes coverage for any damages to the toilet or vehicle that may occur as a result of improper winterization of the toilet. An indicator of improper winterization is freeze damage to the water valve which results in leaks. 
Dometic 310 and 320 series toilet water valves exceed maximum water pressure as defined by North American plumbing code agencies. However, if trapped water freezes in piping that supplies water to the toilet, it expands and creates extremely high pressure that can damage the valve (see photo).
To avoid this, winterize the toilet as described in this manual. If freeze-damage occurs as a result of improper winterization, replace the water valve with a 300/310/320 toilet water valve kit, part number 385311641. IF WATER VALVE IS RETURNED FOR WARRANTY CLAIM, DOMETIC RESERVES THE RIGHT TO DENY CLAIM IF PROBLEM IS CAUSED BY FREEZE DAMAGE. " Unquote...
Fig. 6 A – Freeze Damage Indicator Window: white stress marks indicate freeze damage
B – Water valve damage due to severe exposure to below-freezing temperature"

a 1/4" Nut-driver works just as good as a 1/4" socket on removing the screw from the back (refer to video).

this looks like it may be the issue, just not as bad, before i reinserted the flush valve.  so i believe we have freeze damage to our flush valve.

I'll try to source locally before ordering off AMZN, as it will travel by steamship up the Missouri, then by train, stagecoach, and finally by "Dray" Delivery.  There is no AMZN Next or One or Two-day up here. but they are more than willing to charge you for it.

 

Edited 11 hours ago by SNY SD UP

[topgun2]

I guess that it does "pay" to read those manuals?

What?  Y'all ain't got no Pony Express over there in Missoura?  😇

Bill