Types of riser

Are you looking for:

• Dry riser: Used to supply water within buildings for fire-fighting purposes. Dry risers do not contain water when they are not being used, but are charged with water by fire service pumping appliances when necessary.
• Wet riser: Used to supply water within buildings for fire-fighting purposes. Wet risers are permanently charged with water.
• Stairs riser: The vertical face between the back of the tread of one stair and the front of the tread of the stair above. Risers may be solid, or may be open.
• Vertical riser: The term used to refer to any component that extends vertically through a building.
• Multi-purpose riser. A multiple service vertical distribution module, constructed from primed or galvanised mild
  

steel and incorporating appropriate building services that may be lagged (insulated).