P-Trap for bathtub
Posted by Kirk Ellsi on April 23, 2002 at 18:43:03:
Books always indicate a 1 1/2" trap for a tub, but 2" for a shower. What I don't get is that a 1 1/2" horizontal drain is too small for the number of fixture units for a bathtub. So why use a 1 1/2" trap ?

Is there any harm in using a larger 2" trap and horizontal drain pipe for the tub, too ? Are bathtub drain sizes made for a 1 1/2" trap so a 2" trap will not work ?

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