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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Here’s links to some of our other articles about PLUMBING DRAINS AND TRAPS:
• Why can't a sanitary tee be used for a horizontal-to-horizontal drain pipe connection?
• Why is it a problem when a trap under a sink is installed backwards?
• What are the code requirements for plumbing vent terminations?
• What are the code requirements for layout of drain piping under sinks?
• What is the difference between a vent stack and a stack vent?
• What is a "combination waste and vent" in a plumbing system?
• What is an indirect waste receptor?
• What is the difference between water pipe and sewage (waste) pipe?
• How can I tell if a house is connected to a septic tank system or sewer?
• What is an auto vent, air admittance valve, or check vent?
• Can I make a trap under the sink from straight pipe and 90º elbows?
• Why is there a flexible accordion pipe under the sink?
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