Tub Shoe/Drain Sizes & Adapters

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). 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.

Tub Shoe Sizes
OD/strong> TPI Brand
1 1/4 16
1 3/8 16
1 1/2 11 1/2 American Standard,
Central Brass, Gerber,
Price Pfister
1 13/16 14 Crane / Sayco
1 7/8 11 1/2
2 1/16 16 Kohler
2 1/4 14
2 1/4 16

 

Tub Shoe Adapters
Part No. OD | TPI ID | TPI Composition Price
BW182250 1-3/4 16T 1-5/8 16T Brass  $14
KIS58-7184 1 13/16 14T 1 13/16 Brass  $11
? 2-1/4 1-1/2 Brass $16.00
BW106510 2-1/4 16T 1-5/8 16T Brass $16.00

1-3/8 in. NPSM (1-5/8 in. x 16 UNC) fine-thread body exterior

1-1/2 in. NPSM (1-7/8 in. – 11-1/2 UNC)

NPSM – American National Straight Pipe Thread for Mechanical Joints

TPI – Threads Per Inch

UNC – Unified Coarse Thread

Specializing in plumbing repair parts and accessories since 1988