3" Cast Iron To 2" Pvc Under Concrete. Which Adapter? - Plumbing - DIY Home Improvement | DIYChatroom
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Like Tree3Likes
  • 2 Post By TheEplumber
  • 1 Post By rferoni
Reply
 
Thread Tools Search this Thread
Display Modes
Old 02-14-2017, 10:12 AM   #1
Member
 
Join Date: Apr 2013
Location: Michigan
Posts: 92
Rewards Points: 151
Default

3" cast iron to 2" pvc under concrete. Which adapter?


Hello all,

Posted almost a year ago about my basement shower. Well finally got it framed out and water supply plumbed. I'm literally in the process of connecting 2" pvc drain to the 3" cast. Which adapter do I use?

I'm only tying in to one end of the cast iron. I did not have to cut out a section as the shower drain ties in to the main somewhere down the line.

I originally bought a fernco coupling that slips over the cast and the pvc and then is tightened down by two stainless steel bands(I call them hose clamps). I now see there is a 'bushing' style adapter also. It is pounded inside the cast and then the pvc is pushed into it. Is one preferred over the other? Both are acceptable to be buried so it just seems a matter of preference.

Thanks,
Ron
rferoni is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-14-2017, 10:30 AM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 24,687
Rewards Points: 13,138
Blog Entries: 41
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


Ferncos are well proven. I get a bit worried with the non-shielded units when you are burying them. They can get pretty beat up.

With the bushing, it might be a bit more "robust" in that it is inside the cast iron.

The reality is that you can use both if you want.
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-14-2017, 10:40 AM   #3
Member
 
Join Date: Sep 2012
Posts: 12,643
Rewards Points: 6,286
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


I've always felt the bushing would be a smoother transition with the pvc extending into the cast what ever distance is preferred or allowed rather than having a 90 turn of water and debris at a fernco joint.
SeniorSitizen is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-14-2017, 10:44 AM   #4
Member
 
Join Date: Apr 2013
Location: Michigan
Posts: 92
Rewards Points: 151
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


Thanks for the replies.

SeniorSitizen, what do you mean by 90*? It is a horizontal connection. One can shove the smaller pipe in as much as you want using either adapter.

Ron
rferoni is offline   Reply With Quote
Old 02-14-2017, 10:47 AM   #5
Member
 
Join Date: Sep 2012
Posts: 12,643
Rewards Points: 6,286
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


Quote:
Originally Posted by rferoni View Post
Thanks for the replies.

SeniorSitizen, what do you mean by 90*? It is a horizontal connection. One can shove the smaller pipe in as much as you want using either adapter.

Ron
Yes, my error.
SeniorSitizen is offline   Reply With Quote
Old 02-14-2017, 11:50 AM   #6
Plumber
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 11,429
Rewards Points: 240
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


All the model codes I have worked under do not allow ferncos inside a building.
If you have the cast iron hub, then go with the rubber insert doughnut. If no hub is there, then use a shielded no hub coupling designed for CIxPL. Use a plastic bushing to get down to 2"

Sent from my XT1650 using Tapatalk
bob22 and Windows on Wash like this.
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is offline   Reply With Quote
Old 02-14-2017, 04:25 PM   #7
Member
 
Join Date: Mar 2013
Location: Ohio
Posts: 5,690
Rewards Points: 1,926
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


Quote:
Originally Posted by TheEplumber View Post
All the model codes I have worked under do not allow ferncos inside a building.
If you have the cast iron hub, then go with the rubber insert doughnut. If no hub is there, then use a shielded no hub coupling designed for CIxPL. Use a plastic bushing to get down to 2"

Sent from my XT1650 using Tapatalk

The mans right it's your house so do it correctly all rubber ferncos do not hold pipe alignment and present a lot of jagged edges to snare junk.

The band name he is looking for is proflex or mission brand.
Ghostmaker is offline   Reply With Quote
Old 02-14-2017, 06:19 PM   #8
Member
 
Join Date: Apr 2013
Location: Michigan
Posts: 92
Rewards Points: 151
Default


Well. Wished I would have saw these posts earlier. I went ahead with the fernco coupler(box stores didn't have 3" by 2" donut) and even buried it in sand. Then I saw EPlumbers post. So I unburied it and got the right stuff and redid it. Only cost me a 2" ptrap.
TheEplumber likes this.
rferoni is offline   Reply With Quote
Old 02-14-2017, 10:05 PM   #9
Plumber
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 11,429
Rewards Points: 240
Default

Re: 3" cast iron to 2" pvc under concrete. Which adapter?


Glad you went the extra step. Good luck with the shower and we're here for ya
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Concrete Basics for the DIYer Mort Concrete, Stone & Masonry 7 11-22-2012 11:19 AM
Cast iron vs mod/cons rickmay HVAC 46 10-21-2011 03:42 PM
cast iron or pvc treerat Plumbing 1 03-29-2011 06:38 AM
Help with Cast Iron Material Tester Plumbing 2 10-25-2007 10:58 AM




Top of Page | View New Posts