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holding tank vent fitting
I have tried to read everything I can find here on the subject so if there are other posts you think would be useful, please let me know.
My holding tank has just 1 vent, is small (maybe 5/8") and it goes to a fitting on the deck that looks like a water fill or something. I hear it hissing whenever I flush the head. I'll be out there Wednesday and may be able to get a picture. But the bottom line is that I need a new (and likely 2) vent fittings.
My question is this - what to use as a vent fitting. I have read a standard 1" through-hull just below the rail.
1. This seems big, and 2. is there no "holding tank vent fitting?"
Please forgive my ignorance, but drilling holes in my boat makes me queazy!
I have a Tartan 3000, '83 and sail mostly in protected water with trips out in the ocean as often as I can (a few times a year).