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Glossary
Bypass mode: Allows water to re-circulate within pump when the gun trigger is not pulled.
Chemical hose: Feeds cleaning agents into the pump to mix with the water. Refer to Chemicals
and Cleaning Solvents.
Chemical injection system: Mixes cleaners or cleaning solvents with water to improve cleaning
effectiveness.
Choke control: Opens and closes carburetor choke valve.
CU: Cleaning Units. GPM multiplied by PSI. (GPM x PSI = CU)
Fuel valve lever: Opens/closes connection between fuel tank and carburetor.
GPM: Gallons Per Minute. The unit of measure for the flow rate of water.
PSI: Pounds per Square Inch. The unit of measure for water pressure. Also used for air pressure,
hydraulic pressure, etc.
Quick-connect spray wand: Allows the user to quickly change out high-pressure nozzles. Refer
to Spray Wand Nozzles.
Thermal relief valve: When the temperature inside the pump rises too high the valve will open and
release a gush of water in an effort to lower the temperature inside the pump. The valve will
then close.
Water supply: All pressure washers must have a source of water. The minimum requirements for a
water supply are 20 PSI and 5 gallons per minute.
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