312.12 Rodentproofing — 2025 California Plumbing Code

Strainer plates on drain inlets shall be designed and installed so that no opening exceeds 1/2 of an inch (12.7 mm) in the least dimension.

312.12.1 Meter Boxes. Meter boxes shall be con structed in such a manner as to restrict rodents or vermin from entering a building by following the service pipes from the box into the building. 312.12.2 Metal Collars. In or on buildings where openings have been made in walls, floors, or ceilings for the passage of pipes, such openings shall be closed and protected by the installation of approved metal collars securely fastened to the adjoining structure. 312.12.3 Tub Waste Openings. Tub waste openings in framed construction to crawl spaces at or below the first floor shall be protected by the installation of approved metal collars or metal screen securely fastened to the adjoining structure with no opening exceeding 1/2 of an inch (12.7 mm) in the least dimension.