I know what you mean. I got up real close and personal with mine with a flashlight (Doctor!) to figure out what I had. It didn't say Traveler Lite anywhere I could read but it looks just like that one from Dometic's site.
Okay, I just got a bit smarter. I realized I had my mega-3-ring binder here in the trailer with all my manuals. Yes, Traveler Lite Toilet Model 210.
Some part numbers for you:
385310677 Seal Replacement Kit
385310681 Ball, Shaft and CRTG kit (include item 385310683)
385310683 Spring Cartridge Kit
Manual says the plate with the model/serial is located on the toilet base (remove base cover to reveal).
Per the manual, in addition to trying to clean the flush ball and seal, lubricating it with cooking spray/furniture polish, another possible cause to the ball not sealing completely is a defective spring cartridge.
Sealand Product Hotline: 800-321-9886 (8am - 5pm ET)
See attached for manual.
Place that sells the parts (
link).
Good luck,
Jim