Using a reducer bushing on DWV Wye

Users who are viewing this thread

Nick Wombosi

New Member
Messages
3
Reaction score
0
Points
1
Location
Santa Clara CA
Can one use a reducer bushing on a 4x4" Sanitary Wye to tie in a 3" lateral line into a 4" main line ?
Both lines are horizontal with sufficient pitch.
If not, what is the correct way to tie in ?
 

Breplum

Licensed plumbing contractor
Messages
1,162
Reaction score
444
Points
83
Location
San Francisco Bay Area
Broadly speaking adding a bushing to a branch on a sewer is fine.
However there are circumstances where it can be an issue, especially as it pertains to sewer jurisdictions that have their own rules.
For example, in multiple cities we work in, the sewer department prohibits any 3" drain runs longer than a few feet stubbed out of the dwelling, after the stub, the entirety of all sewer on the property must be 4" with no exceptions. With dug trenches, there are serious compaction and back fill support rules in place as well.
Consult your local sewer department before even digging.
 

Nick Wombosi

New Member
Messages
3
Reaction score
0
Points
1
Location
Santa Clara CA
Broadly speaking adding a bushing to a branch on a sewer is fine.
However there are circumstances where it can be an issue, especially as it pertains to sewer jurisdictions that have their own rules.
For example, in multiple cities we work in, the sewer department prohibits any 3" drain runs longer than a few feet stubbed out of the dwelling, after the stub, the entirety of all sewer on the property must be 4" with no exceptions. With dug trenches, there are serious compaction and back fill support rules in place as well.
Consult your local sewer department before even digging.
Thanks. Could you explain what you mean by stub ? In this case, we have a 3" line coming from a bath about 10' under the house before going into the 4" Wye with a reducer. Everything downstream from that is 4". Ideally, I would have liked it to be a 3"x4" single piece Wye or combo. Not sure if using a reducer impedes smooth flow.
 

wwhitney

In the Trades
Messages
5,817
Reaction score
1,529
Points
113
Location
Berkeley, CA
I believe breplum's comments were just about sizing, not about the use of a bushing vs a reducing coupling vs a reducing fitting. 4x4x3 wyes are available, if that is what you need.

Also, the term "sewer" refers to a buried drain outside the footprint of a building.

Cheers, Wayne
 

wwhitney

In the Trades
Messages
5,817
Reaction score
1,529
Points
113
Location
Berkeley, CA
I'm not aware of any code restrictions on doing so on one of the two inlets.

I also don't know if there are situations where it would perform better to instead use a 4x3 reducing coupling upstream, or a 4x4x3 wye.

Cheers, Wayne
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks