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: 1 year warranty against manufacture defects. Brand leader MPN LJT167122S01 UPC Does not apply Type Parts - Unloader Valve Model Valve Kit Warranty 1 Year Surface Finish New .