Tie into cast iron - Plumbing Zone

**Bill** · 09-08-2008, 07:58 PM

OK. I have to tie into a 3" x 2" cast iron fitting so I can run my PVC. I need to remove the 1-1/2" galvanized pipe which is completely cloged up that has been installed with oakum and lead then try to attatch a 2" PVC to the cast iron hub because I have a shower drain that must run into it.. I was thinking a fernco to do this though the supply houses say I cant because the fernco wont go over the outside the hub. My other option was to insert the 2" PVC into the hub and reset the oakum then pour lead around the PVC. I CAN NOT remove the cast iron without disturbing the downstairs walls which I really do not want to do.

Also what is the best way to install a PVC toilet flange into a cast iron fitting? I know they have those screw in type with the rubber gasket. I may use that with some duck grease on the rubber.

Any thoughts?

"DAPlumber" 101 · 09-08-2008, 08:05 PM

Quote:

Originally Posted by USP45

OK. I have to tie into a 3" x 2" cast iron fitting so I can run my PVC. I need to remove the 1-1/2" galvanized pipe which is completely clogged up that has been installed with oakum and lead then try to attach a 2" PVC to the cast iron hub because I have a shower drain that must run into it.. I was thinking a fernco to do this though the supply houses say I cant because the fernco wont go over the outside the hub. My other option was to insert the 2" PVC into the hub and reset the oakum then pour lead around the PVC. I CAN NOT remove the cast iron without disturbing the downstairs walls which I really do not want to do.

Also what is the best way to install a PVC toilet flange into a cast iron fitting? I know they have those screw in type with the rubber gasket. I may use that with some duck grease on the rubber.

Any thoughts?

Instead of putting a 2" piece of pvc into 2" hub and leading around it get a 2" galv nipple and then after it is leaded in use your fernco or clamp all.

I have seen pvc leaded in but your taking a chance do to the extreme heat.

Killertoiletspider · 09-08-2008, 08:11 PM

Our code calls for the proper transition fitting, so I would use a 2" PVC hub adpt and pour a lead joint.

Those bolt in closet flanges are a code violation here, why not just install another CI flange?

**ILPlumber** · 09-08-2008, 08:56 PM

Quote:

Originally Posted by Killertoiletspider

Our code calls for the proper transition fitting, so I would use a 2" PVC hub adpt and pour a lead joint.

Those bolt in closet flanges are a code violation here, why not just install another CI flange?

Agreed. One thousand percent.

Ron · 09-08-2008, 10:22 PM

Use a 2" seal tight, thats what I would use.

**ILPlumber** · 09-08-2008, 10:28 PM

I never had a heat issue caulking in PVC in a CI hub. They look quite nice when done. If it's in a house they might not like the smell though. I have had success with the seal tites

I wouldn't use a fernco on the outside of the hub. Big edge there to catch all kinds of stuff on. As well as not being code compliant here.

Ron · 09-08-2008, 10:37 PM

This is the fernco donut, I call them seal tights, fit into the hub of cast. Comes in many sizes.

**ILPlumber** · 09-08-2008, 10:40 PM

Yup. Those babies fit nice and tight. I usually have to put some gasketed pipe lube on the pvc to get it in. Chamfered end helps temendously.

Ron · 09-08-2008, 10:41 PM

Yep pipe dope is needed to persuade the pipe to bottom out in it.

Killertoiletspider · 09-08-2008, 10:44 PM

Code violation to use a gasket above ground in Chicago, IL would know state code better than I.

09-08-2008, 07:58 PM	#1
Bill Moderator Join Date: Jun 2008 Location: I have no idea! Posts: 5,868 My Photos	Tie into cast iron OK. I have to tie into a 3" x 2" cast iron fitting so I can run my PVC. I need to remove the 1-1/2" galvanized pipe which is completely cloged up that has been installed with oakum and lead then try to attatch a 2" PVC to the cast iron hub because I have a shower drain that must run into it.. I was thinking a fernco to do this though the supply houses say I cant because the fernco wont go over the outside the hub. My other option was to insert the 2" PVC into the hub and reset the oakum then pour lead around the PVC. *I CAN NOT* remove the cast iron without disturbing the downstairs walls which I really do not want to do. Also what is the best way to install a PVC toilet flange into a cast iron fitting? I know they have those screw in type with the rubber gasket. I may use that with some duck grease on the rubber. Any thoughts? __________________ Virginia Plumbing Codes Virginia Department of Licensing Ones intellect can often be summed up by his own words Everything in the known universe is governed by "Cause and Effect", there is no getting around it. Think about what you do before you do it.

09-08-2008, 10:22 PM	#5
Ron Senior Member Join Date: Jun 2008 Posts: 8,635 My Photos	Use a 2" seal tight, thats what I would use. __________________ Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

09-08-2008, 10:41 PM	#9
Ron Senior Member Join Date: Jun 2008 Posts: 8,635 My Photos	Yep pipe dope is needed to persuade the pipe to bottom out in it. __________________ Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

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09-08-2008, 08:11 PM	#3
Killertoiletspider Senior Member Join Date: Jun 2008 Posts: 2,411 My Photos	Our code calls for the proper transition fitting, so I would use a 2" PVC hub adpt and pour a lead joint. Those bolt in closet flanges are a code violation here, why not just install another CI flange?

09-08-2008, 10:28 PM	#6
ILPlumber Moderator Join Date: Jun 2008 Location: IL Posts: 5,312 My Photos	I never had a heat issue caulking in PVC in a CI hub. They look quite nice when done. If it's in a house they might not like the smell though. I have had success with the seal tites I wouldn't use a fernco on the outside of the hub. Big edge there to catch all kinds of stuff on. As well as not being code compliant here.

09-08-2008, 10:40 PM	#8
ILPlumber Moderator Join Date: Jun 2008 Location: IL Posts: 5,312 My Photos	Yup. Those babies fit nice and tight. I usually have to put some gasketed pipe lube on the pvc to get it in. Chamfered end helps temendously.

09-08-2008, 10:44 PM	#10
Killertoiletspider Senior Member Join Date: Jun 2008 Posts: 2,411 My Photos	Code violation to use a gasket above ground in Chicago, IL would know state code better than I.