That s a common pipe size for tubs.
Different size tub drains.
Tub drain assemblies can be joined with slip fittings brass abs or pvc or with solvent glued fittings abs or pvc only.
Built in tubs can present a bit of a challenge however.
The type of trap used on a tub drain is a p trap.
Because they are the same size the.
The proper size for both a bathtub drain and trap is 1 1 2 inches in diameter regardless of the bathtub size.
A freestanding tub makes measuring easy since everything is exposed.
How what to measure.
One of the most confusing and annoying plumbing problems is replacing the bathtub drain called a plug that screws into the base called a shoe.
A standard modern bathtub drain is 1 1 2 inches in diameter the width straight across the middle.
The actual drain pipe that s in the slab the plumber will connect to is probably 1 and one half inch diameter.
Rough in plumbing should be calculated for a 1 1 2 inch pipe.
Tub shoe drain sizes adapters.
Tub drain assemblies are commonly made from one of three different pipe materials.
There are two common thread types 16 and 11 1 2 threads per inch and one uncommon one 14 tpi.
We sell a variety of shoe adapters some are only available from us.