I have a '91 Excella Classic 1000 34ft trailer.
I am replacing the Thetford Galaxy Starlite toilet with a Dometic 320. In my attempt to do this, I removed the factory carpet from the bathroom because I am planning to get rid of all that, and carpet near a toilet is just plain ridiculous. There is no platform for the toilet, it just sits on the floor.
To my questions and concerns:
The Thetford mounting bolts are at 11 and 5 o'clock on the closet flange. I supposed I could unscrew it from the wood floor and twist it around to get that aligned for the Dometic 9 and 3 positions.
I am not sure if the flange is glued down though, but it seems like some solutions people have posted here should that be the case is to use a multi-tool and grind in slots in lieu of unscrew/rotate. Anyone have an opinion?
My main concern though is the way the flange is situated
. There is no "funnel" part of the flange to direct the flow into the black tank. The plywood is totally exposed as I see it. I did notice the old toilet has a smaller opening at the bottom which seems like the same size as the current opening. However, the Dometic opening is definitely larger, enough to obviously splash the flow on the way down.
*What is going on here? Was there some replacement to a different flange in this trailer's past? The flanges I see to purchase for Airstreams show either a funnel or a threads to screw into the black tank.
* The plywood looks like OSB and not marine plywood. Is this the way the wood should look like in this location? The carpet to me is the original carpet because I had to cut it out so replacing the wood would have required some work on that to have effected a change.
*Can someone help me understand if there is a flange I should be using instead of the current one and/or should I be concerned at all and just bolt the new toilet and flush on? My gut tells me that hole size is too small to leave it that way. Here is what I think I should have installed as it provides a funnel action into the black tank and protects the wood from exposure of the incoming.
pic 1 - This is the current situation with markings showing the Thetford and Dometic alignments. It also shows the flange and the hole through the plywood.
pic 2 - This shows more detail of flange and the hole to the black tank. Seems like there is a 1/4" plywood on top of the base marine plywood that looks 7/8" to 1" thick.
pic 3 & 4 - This is a close up view of the flange with measurements.
pic 5 - These are measurements of the Dometic toilet.
pic 6 & 7 - These are the measurements of the Thetford toilet.