Thanks for the tip gldnbrew. I purchased two of these seats and one of them failed about about 2 years later. I tried repacking the bad cartridge with vaseline and an automotive grease I have and neither worked. I'm glad you found something that does. I don't know where to buy ACE brand products where I live, but looked it up and it's advertised as an o-ring grease. I found this grease http://www.homedepot.ca/product/sili...bricant/910532 on the Home Depot site. It's by Moen and is for valve components but looks to be a similar product. I'll purchase some and see if it does the trick and I'll follow your advice for repacking the cartridge. I'm assuming you reused your o-rings as ones that small are going to be hard to find.