The Hot Max 10 foot propane replacement hose is 350 PSI rated and is UL/CSA Listed. 1/4 inch Female Ball Seat Pipe Swivel all brass fittings on both ends so it easily replaces your Big Max, Jr Max, and Model 50100 torch hose. TIP: 1/4 – Inch Female Flared B (also called a Ball Seat Female Pipe Swivel Fitting) is not exactly the same as a 1/4” female NPT fitting. Our female fittings have a brass cone on the inside which helps seal the connection without the use of teflon tape or pipe dope. If you need an adapter for use with NPT fittings, use Hot Max Model 28100 Ball Socket to NPT adapter to convert the female end of these hoses to male NPT fitting