[igotjam]

One of the few manuals that came with my trailer was one for the Dometic/Sealand Concerto toilet. In the manual it gives a list of parts it says you should always have on hand. This is a great idea.
At the beginning of August being proactive I ordered the 5-6 suggested parts. The dealer had no end of problems getting them so I cancelled the order at the end of September. In Oct the toilet malfunctioned. Dometic was very helpful in helping me determine the parts required for a fix. None of the Dometic dealers I spoke with stocked any of the parts needed. I ended up ordering them from Camping World paying an additional $40+ for overnite delivery.
Returning the next day I was advised that CW had just finished the PO to Dometic "they will be here tomorrow". The next day it was Dometics fault they were not here. There was an excuse every day for over a week. After more than a week without a functioning toilet, I gave up and bought a Thetford. It works great and parts are always available.
If you have the Dometic, I suggest you keep parts on hand as it appears they are impossible to get.