According to the National Standard Plumbing Code, the minimum trap size for a shower base (not a tub) is

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Multiple Choice

According to the National Standard Plumbing Code, the minimum trap size for a shower base (not a tub) is

Explanation:
The minimum trap size for a shower base is 2 inches. Showers can deliver a larger, faster flow than many other fixtures, so a trap that's at least 2 inches in diameter helps prevent the trap from siphoning or backing up and ensures the water seals properly between uses. A 2-inch trap is sized to handle typical shower discharge and maintain reliable drainage, while smaller traps would be prone to drainage problems. Larger traps are allowed if the installation calls for them, but they’re not required by the standard.

The minimum trap size for a shower base is 2 inches. Showers can deliver a larger, faster flow than many other fixtures, so a trap that's at least 2 inches in diameter helps prevent the trap from siphoning or backing up and ensures the water seals properly between uses. A 2-inch trap is sized to handle typical shower discharge and maintain reliable drainage, while smaller traps would be prone to drainage problems. Larger traps are allowed if the installation calls for them, but they’re not required by the standard.

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