Mr Heater's Buddy Heater Hose Assembly F273702 connects portable appliances to 20 lb propane cylinders eliminating the need to change smaller propane cylinders periodically throughout the day. The 273701 includes a 12' long hose, swivel throwaway cylinder, excess flow soft nose POL, hand wheel and hand tighten swivel at both ends. Compatible with Mr Heater MH9BX and MH18B Heaters.