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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 pres-
sure. 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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