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OK, I spent more time thinking and posting here than doing the job . I bought two wax rings. I molded one down into the offset flange's "shelf" so that it filled the offset and came up level with the flange. I put the second one on top and then pressed down the hydroseat. Took a look, and...

I think it's a 3" pipe with a socket fitting because I can't see the edge (a 4" inside fitting would have a lip getting larger) http://plasticoddities.com/offset-closet-flanges/ I picked up a HydroSeat today anyway in case it works (and also a new closet flange in case it doesn't). I'll...

Can't see under (finished ceiling below), but the toilet will fit when centered over the pipe, so it's not obvious why they went to the trouble of offsetting it back and to the right (creating a clog machine at the same time).

My toilet kept clogging past the trap, so I removed it to figure out what was up. Sure enough, the installer used one of those garbage oblong offset flanges that cuts off half the pipe area. Photo attached. The worst party is I have no idea why the used an offset flange. It actually pushes...

I did a bit more digging. The Ontario Building code (and national plumbing code) Section 7.4.5.5 calls for a trap seal primer or "equally effective means", which isn't very precise. There is an ASSE standard 1044 which governs trap primers connected to "waste line tail pieces from fixtures...

Cool. I'll add the second vent. What about the tee in the stand pipe?

OK, I thought I could get away with wet venting the floor drain, but I'll double check. Assuming I add the vent, are you agreeing that the two traps can be connected, or do I have to use a trap primer valve?

Thanks, but must I use fresh water to prime the floor drain? This post from Terry a few years ago suggests something like I drew (unless I misunderstand him). I'm just trying to plan the details.

OK... give me the long answer. I'm having a heck of a time finding the "industry standard" way of keeping prime in a floor drain. The local hardware stores don't even sell a trap primer valve.

I am building a second-floor laundry room. There will be a floor drain under the washing machine, and I'm looking for a solution to keeping water in the floor drain trap without being able to reach it easily for maintenance (and without a trap primer valve, which is proving to be hard to find...