Toilet issues

Just get the flange repair kit as linked by 'enblethen'

Keep repairs simple.

Start messing around trying to remove flange and next thing you know you are having to completely redo black tank and drain lines :S

Depends on the vintage and manufacturer. Mine has a pipe glued to the black tank, and the flange is glued to it. No replacing it without dropping the black tank. Depending on where your flange is cracked, it may not be an issue. As the name implies, the gravity toilets just let "stuff" drop into the tank. There's no pressure so not much opportunity for leaks unless the flange is cracked where the toilet seats.

If the concern is that the toilet is no longer secured to the flange, there are adapter kits that you can use (as others have mentioned). I used a kit to install a new Dometic toilet in my old Allegro. The adapter/flange screws down through the floor and has new bolts to secure the toilet. You need to make sure the base of the toilet is still on the floor. The flange isn't designed to hold the toilet up in the air, only to maintain the seal. In my case I had to install a 1/4" riser between the toilet and floor to make up for the adapter.

RJsfishin wrote:
If its like mine, the flange has a 6" long pipe glued into it, The tank has a rubber bushing in it. The flange pipe assy pushes thru the rubber flange, and screws to the floor, no sealer involved.

X 2 on my TT. I had to remove my toilet for a repair and it was much easier than I thought it would be.

If its like mine, the flange has a 6" long pipe glued into it, The tank has a rubber bushing in it. The flange pipe assy pushes thru the rubber flange, and screws to the floor, no sealer involved.

Some flanges are screwed onto the pipe and others are glued.
There is a toilet flange repair kit available at larger hardware stores.
Flange repair kit

I've never had to replace the flange on a RV. For a S&B there are replacement flanges, simple to install. I do not know if they are available for a RV.

Did you check YouTube? Or do a Google search if you don't get a better answer on the forum.

The ease of replacement depends on how the flange is attached to the black tank.

Sorry I don't have a better answer.