Called Thetford, my helper said her IV was 11 years old still working. Mentioned plugging the overflow vent. Told me Bravura replaces nearly all toilets because of Universal Mounting.
Connected toilet to coach water supply but stood it in a shallow pan instead of mounting to the tank. No leaks after several hours. Next plan is to divert the flush water to another container so I can see if the IV drips during or after flushing.
I noticed the water supply line fitting wasn't at all tight when I removed the IV from the coach. Beginning to think it was leaking, running down the line, dripping off at the bend, and going under the toilet. Dripped past the flange into the subfloor.
Current plan - If IV passes leak tests, plug overflow and reinstall. Check fittings for tightness and drips.
God Bless, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100