Rear End/Water Fill Cap Kit,Black Anodized cap with logo and matching weld in aluminum bung. Designed with larger, contoured grip for even easier removal and installation, available with steel or 6061-T6 aluminum bung, can be used on powr steering tanks, radiator over flow tanks, valve covers, rear ends, filler neck platesand other locations to replenish fluid or serve as an inspection port. • These kits come with an aluminum female bung that can be welded to aluminum, tanks, valve covers, filler neck plates and other locations to replenish fluid or serve as an insection port • These kits are available, Knurled Filler Cap with 1.5" O.D. Female weld bung contoured grip for easy removal and installation with either Moroso or Competition Engineering logo, 2.6" O.D. weld bung • Filler Caps are machined from 6061-T6 aluminum and include an O-ring for leak free sealing NOTE: For steel applications, use Rear End Fill Cap No C9085