11:45AM | 04/25/06
Member Since: 04/24/06
3 lifetime posts
I need to replace a section of ABS sewer pipe that is blocked by roots. The bad section is where a 4" pipe meets a 3" pipe. It looks like originally, the 3" pipe was slipped into the 4" pipe and concrete was put around the joint to create a seal. I plan to cut out the bad section and use a reducer to change size and do the last joint with a rubber coupling (Fernco). I have 2 problems. The current connection was placed in such a way as to slightly change directions (about 10 degrees) because the 4" section doesn't quite line up with the 3" section. Will the rubber coupling provide that much flex? The other problem is getting the rubber coupling to slide easily enough to get the connection in place. Can I lubricate the pipe with glyceryn or some other lubricant? Also, will the rubber coupling keep roots out or do I need to do something else?



12:46PM | 04/25/06
Member Since: 01/24/06
1449 lifetime posts
You could not pay me enough to install a "Fernco" coupling

Have you thought about a Mission coupling and No Hub couplings with No hub cast iron fittings rather then try to deflect a piece of rubber and hope it has any integrity?

You do know that cast iron fittings afford you various angles like 1/16 bend 1/8 th bend 1/32 (11/4, 45 deg, 221/2 degree or any combination there of

Trying to deflect a piece of rubber is not really what a semi skilled mechanic would attempt.

Oh well to each his /her own guess if no one can see it who cares?


01:06PM | 04/25/06
Member Since: 04/24/06
3 lifetime posts
I had not realized that bends less than 22 1/2 were available.


03:57PM | 04/25/06
Member Since: 04/24/06
3 lifetime posts
I had not realized that a 1/16 bend was available. After your reply, I went out and found one along with 2 connectors. It looks like exactly what I need.


10:04AM | 04/26/06
Member Since: 01/24/06
1449 lifetime posts
Your very welcome

Cast Iron like Galvanized drainage fittings come in various angles

In Cast they are called 1/32 1/16 /1/6 1/8 1/4 and a return bend (180 degrees)

In Screw drainage the

1/32 = 11/14 deg

1/16 = 221/2

1/6 = 60 deg

1/4 = 90 deg

The reasoning is piping has no "play" especially screwed pipe has no forgiveness so one has to be highly skilled and to allow for those jobs where piping doesn't line up exactly as planned we have fittings of various angles.

With no hub cast iron we can deflect the piping to a certain degree like lead and oakum joints there is some play

Then of course we can always make a crooked thread with a Ridgid 65 R threader



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