My guess is the hole is so you can retrofit a neck wiper, and thus the red cap is something you put on if you don't have that. If it were me, I would silicone it in place rather than weld-on so that it's easy enough to pull off in the future if you get an auto cleaner.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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