Thetford toilet blade seal in T@B 320

There's another entry that calls out the p/n for this. It's called a "Lip Seal" p/n 23721 it's not available from Thetford only dealers and of course Amazon (for a few $ cheaper, currently has it for $15.50 or $30 for two).  It's simple to replace here's a video: hhttps://www.youtube.com/watch?v=Fuo39upYp2s - obviously a good job for gloves...