Ace the Red Seal Plumbing Exam 2026 – Unclog Your Future with Confidence!

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What size drain is typically installed for a residential clothes washer?

1.5 inches

2 inches

A 1.5 inches is too small for a residential clothes washer because it may cause clogging and slow draining.

C: 2.5 inches is larger than necessary and can lead to wasted water and slower drainage times.

D: 3 inches is unnecessary and may result in higher installation costs for the homeowner.

Therefore, the most appropriate size for a residential clothes washer drain is 2 inches. This size provides efficient drainage without overspending on excess pipe size. Additionally, it is a common standard size used in most residential buildings.

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2.5 inches

3 inches

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