This is a new single lip 1 3/8″ outside diameter seal that fits both the screw in and bolt on cap miter boxes. It also fits older Plunger gearboxes. I prefer the double lip seals but they have been out of stock with all of my suppliers for some time now.
You do not want to hit these seals directly with a pressure washer. If you do water will get inside the miter box and rust out the gears and bearings.