Sloan H-700-A Back-Check Screwdriver Stop 1"

A: You are correct, it's best to determine your GPF (Gallon Per Flush) to ensure you're buying the correct replacement Diaphragm Kit. You can determine the GPF of your valve in a couple different ways. On the new valves, there will be a white sticker on the underside of the valve body by the tailpiece, the sticker will have the GPF written on it. If you do not see a white sticker you can look on your porcelain fixture to see if there is a GPF stamped there; this is typically located near the manufacturer brand name. As far as the issue with the Control Stop Valve Leaking, you will want to replace the Control Stop Repair Kit. If you have a Toilet, you will need the 1" Control Stop Repair Kit (Part #101298). If you have a urinal, you will need to determine whether you have the 1" (Part #101298) or 3/4" stop repair kit (Part #101299). To detmine which kit you need, you can measure the back Outer Diameter of the Black Control Stop Repair Kit (opposite end of the adjustment screw). If it measures 1" then you will need the 3/4" repair kit, if it measures 1 1/4" then you will need the 1" repair kit. If you have any other questions our experts are here to help! Call or text 800-518-5388