This windage tray includes molded rubber gaskets on the top and bottom for a one-piece design. The windage tray is made from glass filled nylon & molded rubber (modern materials that hold up to heat & oil). The molded rubber gaskets don't need any RTV, so future service is easy (no scraping off old gaskets and replacing them each time the oil pan is removed). The re-usable windage tray / gasket can be washed w/ soap & water. Made in the USA. Combination Windage Tray & Oil Pan Gasket for Big Block Chrysler / Mopar. Fits 383, 400, 413, 426W, 440 & 426 Hemi. Made From Glass Filled Nylon w/ Molded Rubber Gaskets. Choose From 2 Sizes – Up to 3.75” Stroke, or Up to 4.15” Stroke. Reusable – Wash w/ Soap & Water.