aFe Sight Glass Plug (46-00001) provides a clear view of differential oil levels for aFe Power Street Series and Raw differential covers. This plug allows you to visually monitor fluid levels, eliminating the guesswork and risk of running with low oil. Designed with an 11.5 NPT thread, it fits securely into compatible aFe Power differential covers and enhances functionality not found in most factory or aftermarket options. Whether for maintenance or peace of mind, this sight glass is a smart upgrade for added protection and convenience. Key Features : Compatible with aFe Power Street Series and Raw differential covers Allows visual monitoring of differential oil level Eliminates guesswork and reduces risk of low fluid damage Features 11.5 NPT thread for secure fitment Hex-style plug head for easy installation Designed for front and rear axle cover applications Sold individually