Product Description: This kit contains 6 check valves to rebuild these two pumps listed above and many other RMW vertical pumps that AR builds. We also keep in stock other repair kits for these pumps. Specs: For AR Pumps RMW2G25, RMW2.5G25, RMW2.5G27, RMW2.5G26D-F7 The diameter of the inner ring is about 0.5cm,the outer ring is about 1.0cm and the height is 1.6cm Mounting Bolts: .