Rhode Island Journeyman Plumber Practice Exam 2026 - Free Journeyman Plumber Practice Questions and Study Guide

Strainer plates on drain lines for rodent proofing must have openings that are two pipe sizes greater than the pipe itself to effectively prevent rodent entry while allowing adequate drainage. This sizing ensures a balance between protecting the plumbing system and allowing for proper flow of waste and water.

By utilizing an opening that is two sizes larger than the pipe diameter, the strainer plate allows for sufficient drainage without creating a bottleneck. This approach prevents the chance of clogs from debris while simultaneously establishing a barrier that is difficult for rodents to breach, thereby minimizing infestation risks.

Sizing the openings larger than the pipe itself is a fundamental aspect in plumbing design, ensuring that the system functions efficiently while maintaining safety measures against pests.