Which backflow device includes test ports?

• A. Pressure vacuum breaker
• B. Double-check valve
• C. Air gap
• D. Reduced pressure principle backflow preventer (RPZ), includes test ports.

Answer: (D)

Test ports let a technician attach gauges to verify that the device is functioning properly by measuring pressures on each side of the valve stack and confirming the relief valve operates at the correct differential. The backflow prevention device that includes test ports is the reduced pressure principle backflow preventer. Its design incorporates test cocks specifically for field testing, so a certified tester can confirm there’s no backflow and that the relief valve and checks are sealing as required. Other devices either aren’t designed for on-site testing with test gauges or aren’t built with dedicated test ports in the same way, which is why RPZ is the answer.