Stop valve installed before the meter with one end with coupling for PE pipe and the other end with internal thread for 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.