charcoal extinguisher
A container used to extinguish burning charcoal by covering it, often a ceramic pot or lid.
I extinguished the charcoal fire with a charcoal extinguisher.
火鉢 is a brazier or charcoal heater, while 火消し壺 is specifically a tool for extinguishing the charcoal.
Standard kanji spelling using 壺.
Variant using 壷, a common alternative form of 壺.
Compound of 火消し (hikeshi, 'fire extinguishing') and 壺 (tsubo, 'pot').