Part #78018. Original Mr. Heater replacement temperature / fuel control knob for the older MH18B Mr. Heater BIG Buddy Portable Propane Heaters.
This knob will ONLY fit BIG Buddy heaters with the serial number MHC748000097071 and LOWER.
This knob has a 12.5mm OD shaft size. Please measure outside diameter of knob shaft for proper fit.
For use on Mr. Heater, Heat Star, and Enerco older MH18B BIG Buddy Portable Propane Heaters.
(*Use Part #78418 knob for heaters with the serial number MHC748000097072 and HIGHER, and all CURRENT models, where the knob has a 27mm shaft base*.)