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* 1. Plumbing Defects, by Bryck Guibor

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* 2. What is the only type of water heater that does not require a temperature relief valve, but does require a pressure relief valve?

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* 3. What is the minimum number of atmospheric vents required in a residential plumbing system?

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* 4. What is the required location for a sediment trap on a gas line serving a furnace?

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