Massachusetts Plumbers Journeyman Practice Exam

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Study for the Massachusetts Plumbers Journeyman Exam. Prepare with multiple choice questions, hints, and detailed explanations. Ace your licensing exam with confidence!

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What must potable water connections to a heating boiler be equipped with to prevent cross-connections?

Check Valve
Expansion Tank
Backflow Preventer
Pressure Reducing Valve

The correct answer is: Backflow Preventer

Potable water connections to a heating boiler must be equipped with a backflow preventer to prevent cross-connections. A backflow preventer ensures that water flows in only one direction, preventing any backflow of contaminated water into the potable water supply. This is essential in maintaining the quality and safety of the water supply in a plumbing system. The other options are not suitable for preventing cross-connections in this scenario: - A check valve is designed to allow flow in only one direction but may not offer the same level of protection against backflow as a backflow preventer. - An expansion tank is used to accommodate the expansion of water in a closed-loop heating system and is not directly related to preventing cross-connections. - A pressure reducing valve is used to reduce the pressure in a plumbing system and does not address the issue of backflow and cross-connections.