Glossary term
Backflow Preventer
Device or assembly used to prevent reverse flow into potable water.
Why this term matters
Backflow Preventer can appear in exam questions as a definition, a jobsite condition, a calculation input, or a safety decision. Learn the term, then answer practice questions where the term changes the result.
Exam
Plumbing License Practice Test
Practice IPC-oriented national code concepts for drainage, venting, fixtures, safety, sizing, and trade math, then verify your jurisdiction's adopted code, amendments, exam format, and candidate bulletin.
ExamNHIE Practice Test
Practice home inspection systems, report writing, safety observations, and exam-style scenarios.