Drainage, Waste & VentQuestion 138 of 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
Explanation
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.
Law Reference: 2022 California Plumbing Code (CPC) §710.1Practice all 360 questions free — no signup required.
Related questions on this topic
- A sewage ejector receiving the discharge of a water closet must have a discharge pipe of not less than what diameter and be able to pass a 2-inch solid?
- A sump or receiving tank that collects sewage from fixtures located below the sewer level must be…
- Fixtures with flood-level rims located below the elevation of the next upstream manhole cover must be protected from sewer backflow by…
- Under the CPC, rainwater (storm) drainage and sanitary sewage generally must…
- The air gap for an indirect waste pipe discharging into a receptor must be at least…
- Food-handling equipment such as a commercial food-prep sink or an ice machine must discharge to the drainage system by means of…
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review