Is this issue with the cracked ball valve being irreplaceable true to all Dometic toilets? Are there other brands that are made better and are serviceable. The Dometic toilet(don't remember model number) in my rv was and still is problematic since new. The water valve stuck open once and flooded the bathroom area once. I twisted Dometic's arm for a new original cheapo plastic valve because the toilet was almost new at the time. Then the seal on the bowl decided to not hold water every now and then. I purchased a new Dometic seal and I'm thinking it was around $30. It works better now but I'm not holding my breath!