Thoát nước, Nước thải & Thông hơiCâu 138 / 360
An installed backwater valve must be…
a.buried and permanently sealed
b.accessible for service and maintenance
c.installed only in a vertical pipe
d.located inside the building trap
Giải thích
A backwater valve must be installed so it remains accessible for inspection, cleaning, and repair, typically in a valve box or cleanout enclosure at grade. A buried or sealed valve cannot be serviced and will fail without warning. Accessibility is a core code requirement for any backwater device.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §710.1Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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