Tired of plane old vacuum lines cluttering up your engine bay, upgrade to 4AN black fittings and nylon hoses! We carry a full line up of 4AN hoses and fittings to replace your standard vaccum lines. can be used with our vacuum blocks using 4AN to 1/8" NPT fittings. Stealth and quality is key! Tial Blow Off Valve Banjo Fitting Treadstone 4AN Black Nylon Lines