Which test cock number should be opened to establish flow through a backflow preventer?

Study for the ASSE Backflow Recertification Exam. Enhance your knowledge with multiple choice questions and detailed explanations. Prepare effectively for your recertification!

To establish flow through a backflow preventer, the specific test cock that should be opened is usually designated as the one that allows water to flow through the device so pressure readings can be taken accurately. In a standard configuration for backflow prevention devices, test cock number four is typically the designated test cock for measuring the differential pressure across the assembly, which is critical for determining if the backflow preventer is functioning properly.

Opening this test cock facilitates a controlled flow of water that can provide essential information regarding the performance of the backflow preventer. Utilizing the designated test cock for flow measurements ensures standardization in testing practices, which is necessary for consistent and reliable results in assessing the device's effectiveness in preventing backflow.

Therefore, confirming the correct test cock—in this case, number four—enables technicians to properly evaluate the hydraulic integrity of the backflow prevention assembly under real flow conditions.

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