Heater F273704 Plasticizer-Free Green Hose for Portable Buddy and Big Buddy Small : This is a 10-inch long green hose for use with the mh9b portable buddy and mh18b big buddy. The unique green hose material does not leach oil into the fuel stream. Therefore it does not require use of the f273699 fuel filter that the f273701 & f273702 hoses require. Hands tighten swivels on both ends.