What is the appliance pressure for a Multiversal or Deck gun?

• A. 10 psi
• B. 12 psi
• C. 14 psi
• D. 15 psi

Answer: (D)

Appliance pressure is the pressure delivered right at the discharge device—the deck gun—before the water leaves the nozzle. For a Multiversal or Deck gun, this pressure is kept at a modest level to balance achieving the desired master-stream flow with control and safety. The standard value used in training and practice is 15 psi at the appliance. This accounts for friction losses in the supply hose and the deck gun’s internal design, giving a reliable, controllable stream. Pushing more than 15 psi would increase nozzle reaction and make the stream harder to manage, while less than 15 psi could fail to deliver the intended flow and stream quality. Therefore, 15 psi at the appliance is the best fit for this equipment.