Well pump cable with DRP and plug fitting 4" WPS and Franklin well pump motors 400V. DRP (Dry Running Protector) is an electronic system that optimizes well pump operation in case of water shortage. The device registers the presence of water and controls the pump. In case of shortage of water, it stops the pump and it automatically restarts after a certain period of time without requiring a manual reset. Unlike some systems, DRP does not require additional sensors or cables. DRP is compact, highly reliable, sturdy and easy to install.