Trap Sizes

Reference data and engineering information about trap sizes for miscellaneous applications.

trapsizes

Overview

Engineering reference data for Trap Sizes in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Recommended Trap Sizes

13 rows

Recommended drain trap sizes for various fixtures.
Fixture	Trap Size (in)
Bathtub	1 1/2
Bidet	1 1/2
Dishwasher	1 1/2
Drinking fountain	1 1/4
Floor drain	2
Kitchen sink	1 1/2
Laundry tub	1 1/2
Lavatory	1 1/4
Public toilet	integrated in the fixture
Shower	2
Toilet	integrated in the fixture
Urinal	2
Washing machine	2

Source: engineeringtoolbox.com

Note: 1 inch = 25.4 mm for metric conversions.

References

Original Source

Source: engineeringtoolbox.com