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
PVC sewer line to cast iron hub
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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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hello Brandon
you are using the wrong gasket.
pull it apart
go buy
https://www.hardwareworld.com/ppfkh17/NoHub-Sealant-Quart
and
https://www.ferguson.com/product/compression-service-ez-tite-gasket-sveg/_/A-ProdFamily-88277
paint the inside of the cast iron,,install gasket
paint the inside of the gasket
and the pipe end
be sure to bevel the pipe end
this will not leak
measure the hub debth, mark your pipe that measurement, this gives you a gauge to see if you are all the way in or not
you are using the wrong gasket.
pull it apart
go buy
https://www.hardwareworld.com/ppfkh17/NoHub-Sealant-Quart
and
https://www.ferguson.com/product/compression-service-ez-tite-gasket-sveg/_/A-ProdFamily-88277
paint the inside of the cast iron,,install gasket
paint the inside of the gasket
and the pipe end
be sure to bevel the pipe end
this will not leak
measure the hub debth, mark your pipe that measurement, this gives you a gauge to see if you are all the way in or not
Jeff Handy
Pro Handyman, NOT A Pro Plumber
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.
Just enough bevel so that a hard cut edge does not try to dig into the gasket as it goes in.
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rub it on the concrete..lol hey..it works
FishScreener
Well-Known Member
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.
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.
