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Illinois State Plumbing (Journeyman / Master / Plumbing Inspector) Frequently Tested Exam Questions With Verified Multiple Choice and Conceptual Actual 100% Correct Detailed Answers Guaranteed Pass!!Current Update!! 1. Which chemical substance prevents oxides from forming on freshly cleaned copper before soldering or brazing? A. Solvent B. Primer C. Flux D. Adhesive Answer: C. Flux 2. Where is an escutcheon ring used? A. Inside the wall cavity B. At the valve b...