Flare x MPT Forged Brass Elbow 90° E1F-_ _ is used to convert / connect your existing FPT Female Pipe Thread or Female NPT to a Brass Male Flare Fitting and to a 90° angle. . . or conversely, your Female Flare Fitting to a MPT Male Pipe Thread or Male NPT.commonly used on Water Filters, Regulators, Ball valves, Motors, boats, autos and whatever you may need it for.