Stop valve installed before the meter with one end with a coupling for the PE pipe and the other end with a coupling to the drinking water meter, it has the function of opening / closing through a ball for flow control, located in the central part of the valve body. A hole through the center of the ball connects the inlet and outlet ends of the valve for fluid transfer of current. The ball rotates 90 ° on an axis perpendicular to the fluid stream in order to block the flow in the closed position. The ball is held in place between 2 PTFE (Teflon) seats, which serve as a “Total Tightness” seal. Elastomeric O-rings are used on the stem to prevent fluid leakage.