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Bob3:Unless you're going to O2 over 40% you're probably not going to want to use the Viton, which retails at $57 compared to the $25 or so for the regular kit.
If you're the sort that likes to go 5 years between annuals, then the Viton would be a good investment. You'll want as much in your corner as possible.
Don't forget the rabbit's foot. You get the idea.