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when using the same vent stack as a lavatory you must cut in the 2" sanitary tee for the washing machine trap below the 2"X1 1/2" tee catching the sink waste. the lower the better. Try not to exceed 24" from washer drain outlet to washer trap.

Also,Never flush a major fixture past a minor fixture

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13y ago
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Q: What is the correct way of connecting a washing machine waste vent to an existing bathroom sink vent?
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