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Shutoff valves in plastic pipe ground-source heat pump loop systems shall be installed on both sides of which one of the following?
Correct Answer: D
In the IMC hydronic piping provisions for ground-source heat pump loop systems, shutoff valves are required on both sides of a pressure-reducing valve . That matches D . Heat-fusion joints and change-in-material joints do not trigger this two-sided shutoff-valve requirement.
