Until we find a new O ring or I decide to go ahead and cough up the bucks for a new waterer all together, I've found that the Glad brand of saran wrap, Press 'n Seal, works great.
Little Giant Repair Kit:
3 O rings and one cap for less than $3
http://www.google.com/products/cata...=X&ei=JVoPTtzLGcLagQfJ67z0Dg&ved=0CEAQ8wIwBA#
Little Giant Repair Kit:
3 O rings and one cap for less than $3
http://www.google.com/products/cata...=X&ei=JVoPTtzLGcLagQfJ67z0Dg&ved=0CEAQ8wIwBA#