4 x 3 90's

purple01

do you use 4x3 pvc 90s on a water closet? the 4 inch as the vertical dumping into the 3 inch horizontal or vise-versa. wondering what else you would use them for. thanks

TheEplumber

Yes, 4" wc riser is the only place I use them

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jagans

I would never go from larger to smaller on any type of drainage system.

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TheEplumber

Typically, yes but UPC 316.4.2 "No fitting or connection that offers abnormal obstruction to flow shall be used. The enlargement of a 3" closet bend or stub to 4" shall not be considered an obstruction"

This comes in real handy when doing a ground rough for a slab.
By stubbing up 4" you put the flange into the pipe so you don't need to put excessive pipe wraps on the exterior of the stub to receive an outside hub.

These are the same pipe wraps that the concrete finishers either raise, lower or destroy- causing you to chip the concrete away from the stub to receive the hub

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