PVC sewer line to cast iron hub

Discussion in 'General Plumbing Help' started by Brandon33, Nov 10, 2019.

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  1. Nov 10, 2019 #1

    Brandon33

    Brandon33

    Brandon33

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    20191109_173613.jpg I am working on my grandparents upstairs bathroom as their toilet leaked down through into the living room. The old toilet was lead pipe and tied into the cast iron stack. I removed all the old piping and am trying to install new 4" pvc (sch 40) and use a fernco 4" donut to join the pvc and cast iron hub. Problem is I leak tested everything and I get leaking between the bottom of the rubber donut and the cast hub. I'm concerned that the donut doesnt get a good seal against the cast. The house has all original and was possibly built in the early 1900s I'm assuming. My question are there any sealants (i.e. silicone) that I can use to put around the rubber donut to help it seal with the cast iron or what other solutions would be suggested... they really dont want me to take out the stack and replace with pvc but not sure what other options there would be if I cant get it to seal or cant use a sealant to help ... i appreciate any suggestions. See attached photos
     

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  2. Nov 11, 2019 #2

    frodo

    frodo

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    Just call me Macgyver Professional Supporting Member

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  3. Nov 11, 2019 #3

    Brandon33

    Brandon33

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    Thank you for the recommendation! Do you know of a tool to bevel the sch40 pvc pipe end?

    Thanks again
     
  4. Nov 11, 2019 #4

    Jeff Handy

    Jeff Handy

    Jeff Handy

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    I think any old flat file will bevel the pvc edge.

    Just enough bevel so that a hard cut edge does not try to dig into the gasket as it goes in.
     
  5. Nov 11, 2019 #5

    frodo

    frodo

    frodo

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    rub it on the concrete..lol hey..it works
     
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  6. Nov 11, 2019 #6

    FishScreener

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    I use a trim router with a 22.5-degree, bearing guided, edge bevel bit.

    But, I already owned the router and bits, and was working on 15-inch water lines when I came up with the router as a solution to hand beveling the large PVC pipe.

    It would take a laborer about ten minutes to do a good bevel, and we were doing ten or so a shift. It doesn’t take too many nights of 100 to 120-minutes at prevailing rate, to cover the cost of the router.
     

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