The 2ltr water mist P50 fire extinguisher from Britannia is a service-free unit that only requires a simple visual inspection annually throughout its ten year lifespan. Water Mist extinguishers discharge a curtain of incredibly fine water droplets, creating a mist cloud which surrounds and smothers the flames. This reduces oxygen around the fire, extinguishes the flames, and both cools and dampens the source of the fire to prevent re-ignition.