Ok, guys. Here is the dirt on the o-rings for the LC Industries Water Can. You need all three.
You can get them from
http://www.theoringstore.com/index.php?main_page=index&cPath=367_144
Make sure you get Buna-N FDA O-Rings which is what you need for potable water.
Here are the 3 sizes, you need one of each for one can....
9/16"ID X 11/16"OD X 1/16"CS (For Vent Cap)
014 B70 FDA Black Buna-N 70 O-ring (FDAB70014) $0.04 each
7/8"ID X 1 1/16"OD X 3/32"CS (For Pouring Cap)
118 B70 FDA Black Buna-N 70 O-ring (FDAB70118) $0.12 each
3 1/2"ID X 3 11/16"OD X 3/32"CS (For Large Filling Cap)
153 B70 FDA Black Buna-N 70 O-ring (FDAB70153) $0.54 each
I just ordered 13 complete sets for $14.10 with shipping.
No sense getting ripped off.