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Trap weir

Trap weir

Trap weir

Each trap reqires a vent
Vent is required so trap stays full of water and keep sewer gas out of house
Trap must be full of water to block sewer gas from entering home
Vent allows air into plumbing drain lines so water drains correctly and trap stays full of water

Vent distances are always calculated from the trap weir
Vent cannot be located too close to trap weir, or too far away from trap weir
Vent cannot be closer than 2 pipe diameters away from trap weir
So if pipe is 2" diameter, then vent cannot closer than 4" from trap weir

Vent size is based on size of drain pipe
Codes governing vents can be specific and complicated

Resource:
Drain vent code/ pdf
P-trap

How to take apart P-trap

add a vent
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Sewer smell inside home/ how to install vent

If you are getting sewer gas into home, then trap is not full of water
Slow drain and constantly clogged drainare also symptoms
Adding a sure-vent or quick-vent under the sink will solve problem

Resource:
How to install vent on drain line

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