Protect your heater! Prevent contaminant buildup from causing your Portable Buddy or Big Buddy heater to malfunction with this Mr. Heater Universal Propane Fuel Filter. Recommended for any propane tank 20 lbs. or larger, this filter protects your heater from harm, so you can use it for years to come! Prevent contaminant buildup; Protect against heater malfunctions; Metal construction; High-quality fuel filter; Suitable for propane tanks; Only sizes 20 lbs. or larger; MFG Number: F273699.