Increasing bathtub plumbing from 1 1/2” to 2”

Discussion in 'General Plumbing Help' started by branimal, Mar 14, 2019.

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  1. Mar 14, 2019 #1

    branimal

    branimal

    branimal

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    I'm setting up the rough plumbing for an alcove bathtub. The American Standard tub supports 1 1/2" plumbing.

    My plumbing is No hub Cast iron.

    Is it acceptable to bump up the ptrap , santee, etc to 2" with either a No hub 2x 1 1/2"coupling or 2x 1 1/2" reducer fitting? The bump up would occur in the vertical pipe coming out of the bottom of the tub.

    Thanks!
     

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