Replacing house trap

I have a single vent house trap in my basement. The sewer snake tech said snaking toward the street wasn't a great idea with a single vent house trap. So he only snaked toward the house.

Unfortunately the house side is slightly lower than the street side by 1/2". Not much I can do about that unless I dig up the basement floor.

I'm going to replace the single vent house trap with a double vent house trap.

The pipes toward the house and toward the street are both 4" PVC. The single vent house trap is 4" cast iron. New double vent house trap is 4" cast iron. Measurements are the same for both. 15" if i recall correctly.

1. Can I cap the new house trap with 4" Lead Fit-All Cleanout Plugs?
2. Can I use 4" x 4" ProFlex Coupling (Cast Iron to PVC, Steel or Extra-Heavy Cast Iron) to connect the new house trap?


Thanks!

Take the house trap out and put a piece o pipe in there.

CT18 said:

Take the house trap out and put a piece o pipe in there.

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What about the sewer gases? And rats? I thought house traps were required by code.

Every fixture has a trap right? So there us no need for a house trap.. you would be double trapping every fixture.

And for rats trust me some water in a trap isnt going to stop them from coming in

House traps were code in some areas years ago, they are no longer installed. I started in houses in 1986 and they were outlawed then.

voletl said:

Every fixture has a trap right? So there us no need for a house trap.. you would be double trapping every fixture.

And for rats trust me some water in a trap isnt going to stop them from coming in

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I see you're from NY.
What about NYC Plumbing Code?

I work in NYC and house traps are still widely used. Seen them in small apartment buildings to huge high rises. Why we still install them beats me.

Yes each fixture should be vented. But this is brooklyn. Seems like some of this stuff was built lawlessly. I had to rip open my basement ceiling to fix a leak and saw the bathtub plumbing in the apartment above. No ptrap. Just a 90 PVC elbow.

I'm replacing every bathroom (with new pipes) in this building. But right now I'm living on the 2nd floor and I have a tenant on the first. So I can't rely on each fixture being properly trapped.

I'd like to have the street side snaked out to make sure the tree adjacent to it isn't destroying my sewage pipe.


Here's what NYC says about building traps:

Building traps shall be provided with a cleanout and a relief vent or fresh air intake but in no case less than 3 inches (76 mm) on the inlet side of the trap. The size of the relief vent or fresh air intake shall not be less than one-half the diameter of the drain to which the relief vent or air intake connects. Such relief vent or fresh air intake shall be carried above grade and shall be terminated in a screened outlet located outside the building.

voletl said:

I work in NYC and house traps are still widely used. Seen them in small apartment buildings to huge high rises. Why we still install them beats me.

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I thought I posted this yesterday but apparently never hit the Post Reply button.
I was researching that and the best I could figure was it had to do with having a backup for when/if the fixture traps lost their seal. But I guess it's important to have a vent somewhere between it and the rest of the traps.???