DetMar Vinyl Motorwell Boot For sealed pass-thru of cables, wires and fuel lines. Molded of durable vinyl that resists flex fatigue, gasoline, oil, and U.V. Easily installed with #8 fasteners. Molded-in, tabbed, tear-proof slots provide over 2.5" diameter of open area for cable access without the need to split or cut the boot. 4" diameter opening.