The Sloan H-543-A Control Stop Repair Kit is for use with 3/4” H-600-A screwdriver control stops. This kit replaces all the internal components of the stop valve. The rubber bumper is spring loaded to act as a check valve. A straight blade screwdriver will open and close the valve. Packaging: Bagged. Color: Black. Material / Construction: Metal. Items Included:. Spring. Control Stops. Repair Kit For Screwdriver Control Stops:. H-600-A 3/4". H-540 3/4".