You probably have a Thetford toilet. Aqua Magic Style II. You will need a ball kit which includes parts 4,5,6. Your local RV parts place probably has one in stock. IF this is the toilet you have when you replace the ball, lube it up good with either Vasoline or Plumbers grease which is a silicone grease. Silicone grease available @ any decent hardware store, Lowes, HDepot, etc.
If he is handy, a 30 minute job the first time.
http://www.thetford.com/part/aqua-magic-style-ii/
PPL has them under their part number 83-8167
http://www.pplmotorhomes.com/parts/r...anks/20686.htm
Thetford # is 09868
This is a common problen with this toilet. Many replace the toilet with a Dometic 320. Your call.
http://www.pplmotorhomes.com/parts/r...320-toilet.htm
http://www2.dometic.com/cc57f50b-fdc...76a95624.fodoc
Good Luck Jim
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's