Nitrous Oxide System - NOS Fuel Filter 5/16 in. Hose Barb End to 1/8 in. NPT (15540NOS)The NOS Fuel and Nitrous Filtered Fittings are constructed from aluminum and feature an aircraft type stainless steel mesh filter element to keep containments from reaching the solenoid and plugging jets. As with any filtered system, NOS Nitrous System lines and fittings should be checked periodically and serviced to prevent excessive buildup that can clog the fine mesh screens of the filter fittings. Features: Aluminum fittings with stainless steel