A little tip on using the red plugs,I always fold up a piece of paper towel and put it on top of the butterflies then put the plugs in and then put some duck tape on the outer edge of the plug.
The paper towel will adsorb any excess water that might get inside there. I've done it like this for years and never had any problems and that's a heck of a lot cheaper than the o-ring style.
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Terry James Jr. 
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