Mr. Heater Fuel Filter for Portable Big Buddy Heaters #F273699 Heater fuel filter, for use with Mr. Heaters buddy & big buddy heaters when using hose connection & leaving Gas in hose under pressure Manufactured in China F273699 fuel filter Used with Mr. Heater Big Buddy or Portable Buddy Recommended when using F273701 or F273702 hoses Attaches directly to heater Keeps contaminanats from entering the heater