No Hub Cast Iron Fittings

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JWT1010

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I've taken a permit out to add 4pcs & 3pc bathrooms to our home. Both bathrooms are over a family room / bedroom so I bought cat iron No Hub fittings to reduce noise.

Most of the fitting have a ridge where the 2 sides of mold did not line up. The ridge can be removed/smoothed with a sanding disc. After sanding so some of the fittings still have a 1/64" wide line in the casting which I think may leak.

Would it be a good insurance plan to use a little silicone on all of the fittings just before putting the clamps on and torquing them?
 

JWT1010

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GOOD fittings do NOT have that ridge.


The fitting are from Bibby, Tyler and AB&I.

There's not difference between 1 mfg. and another in the number that have ridges and those that don't. A few have been ground by the mfg. but then they missed the opposite side or the other end.

I was wondering if pro plumbers who know more go through the bins and take the best but that means 40-50% of the fittings are junk.
 

Jeff H Young

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I dont sort them unless they are real bad , if it holds test it should be good.
you could touch it up with grinder.
 

JWT1010

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I dont sort them unless they are real bad , if it holds test it should be good.
you could touch it up with grinder.

I spoke with a friend of a friend this morning who does new apartment buildings. They do the same as you do. Most of what they do has easy access so it may take 10-30min to change a fitting.

In my case the joist are 12" OC so everything will be locked in by the joists. Changing a fitting would involve cutting pipe or taking things apart from the top down.


Here's a 2" fittings with a ridge that I can't see how a clamp would seal next to one I've sanded with an 80 grit flap wheel.

Cast Iron.jpg
 

Jeff H Young

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jwt1010, good plan I'd do that too on a job like that even a file to knock most of it off. you don't want water squirting out on your big screen.
 

JWT1010

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jwt1010, good plan I'd do that too on a job like that even a file to knock most of it off. you don't want water squirting out on your big screen.

Thank You

Decided to use some 100% silicone sealant too. I don't want it to be like the fittings I see weeping when I have to park in an underground parking lot.
 

Jadnashua

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A file or grinder would likely be faster than sanding and less likely to leave a gouge.
 

JWT1010

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A file or grinder would likely be faster than sanding and less likely to leave a gouge.

It takes about 20-40 sec / fitting with a 5" x 80 grit flap wheel on a 4 1/2"grinder

I'm sanding twice as many 2" fittings than 3" & 4" fittings
 
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