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Choose a pressure washer that is best for the job. Different housing materials can withstand various water pressures. The size, or spray power, ranges from 1,200 to 3,000 pounds per square inch (psi).
The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.00401463078662 inch wc, or 0.000145037738007 psi. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between inches water column and pounds/square inch. Type in your own numbers in the form to convert the units! You can do the reverse unit conversion from psi to inch wc, or enter any two units below: I'm feeling lucky, show me some random units. The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in or lbf/in) is a unit of pressure or of stress based on avoirdupois units.