Best Option for Bathroom Trap?

elgato

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• Apr 24, 2009

• #1

I am installing a new bathroom vanity. The tail piece is 1 1/4 and the ABS at the wall is 1 1/2.

Is it best to use a 1 1/2 trap and adapt it at the tail piece or use a 1 1/4 trap with a 1 1/2 to 1 1/4 adapter at the wall? Or, does it even matter?

Thanks

 

Redwood

Master Plumber

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• Apr 24, 2009

• #2

While the flow caracteristics of the 1 1/2" trap are better it may not always fit.

Either is fine.

 

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Kingsotall

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• Apr 24, 2009

• #3

I haven't run into a vanity lav with a 2 inch trap yet. I know I will but haven't yet.

 

hj

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• Apr 25, 2009

• #4

trap

It is immaterial which way you do it. Most times I use a 1 1/2" trap with the reducing slip joint washer on the inlet, but if it is not in a cabinet then I use a 1 1/4" chrome one with the reducer at the trap adapter in the wall.