three - piece stop valves , in both angle and straight - through forms , are disclosed comprising a valve body , resilient control sleeve and handle , with no separate fasteners or sealing elements being required . the handle and control sleeve are retained within the valve body by resilient formations on the handle which snap into a retaining groove on the valve body . inlet line pressure resiliently biases the side walls of the control sleeve into sealing engagement with the valve bore to prevent leakage .