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Thx Wayne, for the reply. The washing machine is trapped and vented in the garage. A lav with trap dumps into the 2” washing machine drain. Together they empty into the main drain as shown in my diagram. The horizontal vent (1.5”) is dry inside and no water sources drain into it. I know...

I am installing a new linear shower drain. What I hope to do is install the new drain upstream of the 1.5” dry vent, however there is already one 2” vented drain that discharges just above the vent (originates at my washing machine). Reading code 909.2, it appears that I should not install the...