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Essentially, if you’re fitting a 1 ¼ inch. If the showerhead flows between 5. 7 and 12. 3 gallons per minute, the drainpipe must be at least two inches in. 1 1/2 is not allowed for a shower drain by most codes but i have seen many use a 2x1 1/2 bushing reducer when installing a shower where a tub used to be and the pipe was neveer changed to the correct size. The minimum size for a shower drain is 1. 5 inches.