Shaft Diameter (Inner Diameter): 2.125 inches (2-1/8") Housing Bore (Outside Diameter): 3.000 inches (3") Overall Width (Thickness): 0.250 inches (1/4") Seal Design Type: HM21Lip Material: Nitrile Rubber (NBR)Max Pressure Tolerance: 3 psi Operating Temperature Range: -40°F to 210°F