How To Look At A House
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Can a trap arm be smaller diameter than the trap under a sink?
Wednesday, March 30, 2022
“A trap shall not be larger than the drainage pipe into which the trap discharges,” according to the International Residential Code (IRC P3201.7). So a trap arm cannot be smaller than the trap.
But, conversely, a larger trap arm is allowed. "It’s never a problem to go up in drain size as long as the slope is correct,” according to plumber James Freeman, of J.W. Freeman Plumbing in Gainesville, Florida.
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