Red Seal Plumbing Practice Exam

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Cross linked polyethylene (PEX) piping is commonly used for:

waste disposal
radiant floor heating
potable water supply
agricultural irrigation

The correct answer is: radiant floor heating

PEX piping is commonly used for radiant floor heating because of its flexibility and durability. PEX is specifically designed to handle hot water, making it a suitable choice for radiant heating systems. While PEX can also be used for other purposes, such as waste disposal and agricultural irrigation, it is not as commonly used in these applications due to its specialized design for hot water use. It is not recommended to use PEX for potable water supply unless it is specifically marked as safe for drinking water.