40X50X4 is a National multi-purpose seal in an industrial size of 1.575 x 1.969 x 0.158. It is a genuine National part from Pro Gear and Transmission, and we are glad to help you match it to your application.FeaturesNational multi-purpose seal, part number 40X50X4Industrial seal size 1.575 x 1.969 x 0.158Genuine National partTech SpecsSeal size: 1.575 x 1.969 x 0.158