Forum Title: How Tight Should Plumbing Bolts Be ?
I've just replaced some toilet tank hold down bolts. The bolts pass through a hole in the tank and have rubber washers on each side of the porcelain, metal washers on the rubber washers, the bolt head on the metal washer inside the tank, and a hex nut on the metal washer outside the tank. How tight should this be?
Category: Plumber Post By: PEDRO VALDEZ (Cheyenne, WY), 04/02/2016

Quote: Originally Posted by Mr_David How did you know? :cool: I have seen that done a time or 2 and they didn't leak. The installer just got lucky. You don't really need the neoprene washer on the bottom side of tank. If you have room to double nut it, use a brass washer and nut on the bottom. The instructions that came with the bolts said to put a metal washer inside the tank between the bolt head and rubber washer as your leftmost diagram shows and a hex nut on the underside of the tank without either a rubber or metal washer. I understand your reasoning for not using the metal washer and letting the underside of the bolt head seal to the rubber washer so what is the manufacturer's reasoning? Did they buy extra metal washer that they want to sell?

- SONIA FITZGERALD (Findlay, OH), 09/15/2017

Quote: Originally Posted by phishfood Do NOT put the metal washers inside of the tank, water will leak between the bolt head and the washer.Ask me how I know. Quote: Originally Posted by Mr_David the neoprene washer has to seal against the under side of the bolt head and the tank. metal washer (brass or stainless steel) only goes on the exterior side of the tank and or bottom end of bolt. How did you know? I have seen that done a time or 2 and they didn't leak. The installer just got lucky. You don't really need the neoprene washer on the bottom side of tank. If you have room to double nut it, use a brass washer and nut on the bottom.

- BETTY THOMAS (San Antonio, TX), 09/24/2017

Do NOT put the metal washers inside of the tank, water will leak between the bolt head and the washer. Ask me how I know. If you bring them down together, you can usually get them pretty tight. Push down on the side of the tank as you tighten that side a little bit, then do the same to the other side, lather, rinse, repeat. Occasionally I have to use soft plastic shims to get the tank to stop rocking.

- LAUREN BOWMAN (Lawton, OK), 10/03/2017

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