The PWMA has developed standards to educate the industry. The following standards are available for free download:
PWMA PW101 provides a uniform method of testing and rating the pressure and water flow of pressure washers, the product’s two primary performance characteristics. The standard applies to pressure washers intended for the household, farm, consumer, or commercial/industrial markets.
The purpose of this standard is to provide uniform dimensions method for 1/4" quick connect coupler plugs for portable pressure washers. 1/4" Quick connect (QC) couplers are used to join or separate quickly fluid conducting lines, without the use of tools or special devices, typically related to the pressure washer spray nozzle.
The purpose of this standard is to provide uniform dimensions method for 3/8" quick connect coupler plugs for portable pressure washers. 3/8" quick connect (QC) couplers are used to join or separate quickly fluid conducting lines, without the use of tools or special devices, typically related to pressure washer hose, gun and pump connections.
The purpose of this standard is to provide uniform dimensions method for M22 thread connect coupler receptacles for portable pressure washers. M22 couplers are used to join or separate quickly fluid conducting lines, without the use of tools or special devices, typically related to the pressure washer hoses, pumps, spray guns and wands.
The purpose of this standard is to provide a marking method for spray nozzles used with pressure washers to help indicate pressure/flow rating as well as spray angle. Spray nozzles are used to dispense water at various pressure and flows as well as at various spray angles.