Quote:
Originally Posted by Lucas
To get a seal. The hole in the cap has a grommet in it. Otherwise the water will seep out of the funnel.
They actually used to sell the caps. Probably not anymore in California.
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I still don't understand why you need to drill a hole in the cap to use the funnel and why you need a seal. You are using the funnel to fill the expansion tank? You are not using it to do a pressure test?
