The SV500 is a fully serviceable spray head valve cast from Marine grade alloy with an output capacity of up to 500 litres per minute (120 US Gallons per minute) and provides a dense even spray discharge of up to 12 metres (40 feet) and a spray width of up to 11 metres (36 feet).
A fully adjustable cast aluminium spray ring allows infinite flow and spray pattern variation. Air pressure holds the valve closed while water pressure opens the valve (approximate valve opening pressure 0.55 bar / 8 psi).
 
An internal spring closes the valve when the water pump is shut down or an absence of air pressure exists and eliminates the need for additional shut off valves.