Bath Tub minimum trap size is required to be what size?

Bath Tub minimum trap size is required to be what size?

• A. 1 inch
• B. 1-1/2 inches
• C. 2 inches
• D. 2-1/2 inches

Answer: (B)

Bathtub drain traps are sized to handle the fixture’s flow while preserving the water seal. For a tub, the minimum trap size is 1-1/2 inches. This size provides enough capacity to carry the tub’s waste without frequent clogs or loss of the trap seal. A smaller trap, like 1 inch, would be undersized and more prone to problems, while larger sizes such as 2 inches or 2-1/2 inches are not required as the minimum. So the smallest acceptable trap size for a bathtub is 1-1/2 inches.

Bathtub drain traps are sized to handle the fixture’s flow while preserving the water seal. For a tub, the minimum trap size is 1-1/2 inches. This size provides enough capacity to carry the tub’s waste without frequent clogs or loss of the trap seal. A smaller trap, like 1 inch, would be undersized and more prone to problems, while larger sizes such as 2 inches or 2-1/2 inches are not required as the minimum. So the smallest acceptable trap size for a bathtub is 1-1/2 inches.