There are several types of hose designed specifically for the fire service. Those designed to operate under positive pressure are called discharge hoses. They include attack hose, supply hose, relay hose, forestry hose, and booster hose. Those designed to operate under negative pressure are called suction hoses.
Swinging fixed hose reels have classed:A,B
Class A: Ordinary Fires involving wood, paper & textiles
Class B: Liquid fuels and gasses
SIZES: 20MM, 25MM