MSR10 (watervalve ring)inside dim. 10 inches, outside dim. 29 inches, 30 pounds MSR26 (manhole ring)inside dim. 26 inches, outside dim. 48 inches, 72 pounds MSR28 (manhole ring)inside dim. 28 inches, outside dim. 48 inches, 65 pounds MSR31 (manhole ring)inside dim. 31 inches, outside dim. 48 inches, 56 pounds