OD.(outside diameter): 25.5 mm / 1 inch, <br> ID.(inside diameter): 18 mm / 0.71 inch , <br> Thickness: 1.95 mm / 0.08 inch <br><br> This transmission fluid drain plug crush washer is for Honda Accord Acura Civic Odyssey CRV CR-V Pilot Fit Element etc. <br> This 18 mm / 0.71 inch aluminum automatic transmission fluid drain plug crush washer seal is needed to change transmission fluid This is the direct replacement for the part# 90471-PX4-000 90471PX4000.