McDonald® Ball Curb Stops with Di-Electric connection maintain their low turning torques and bubble-title 300 psig water pressure rating due to the PTFE coated brass ball that is supported by two blow-out proof EPDM seals. The end piece joint is sealed with EPDM O-ring and thread locker. McDonald® Ball Curb Stops offer positive shut-off from either direction and are available with a wide variety of end connections or Minneapolis Curb Box Threads. A brass 2 in square operating head that is easily pinned to existing curb stops are available separately. A nylon bushing is available and factory assembled and tested. This nylon bushing is designed to stop the flow of stray electrical current. Many configurations are available, contact factory to design for your requirements.