SIMPSON MorFlex 80392 — 40 ft pressure washer hose

5/16-inch inside diameter · rated up to 3,700 PSI · cold-water use.

40 ft3,700 PSI5/16 in ID

The 40-foot, 5/16-inch MorFlex offers a different reach from the other MorFlex lengths. Choose length based on your work area; verify your machine’s pressure, the exact M22 fitting insert dimensions and any adapter required. Do not assume every M22 hose fits every M22 washer.

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Specifications at a glance

Brand	SIMPSON
Model	80392
Product line	MorFlex
Length	40 ft
Inside diameter	5/16 in
Maximum pressure	3,700 PSI
Water application	Cold
Connection family	M22 threaded — confirm insert size and seal
Maximum temperature	140°F (manufacturer MorFlex specification)

Manufacturer-sourced information. Verify exact product variant and fittings before ordering.

What to know about this hose

The SIMPSON MorFlex 80392 is listed as a 40-foot hose with a 5/16 in inside diameter and a maximum pressure rating of 3,700 PSI. The points below explain the buying decisions these published specifications raise; they are not a claim of fitment with any particular pressure washer.

Plan your working reach

At 40 ft, this hose offers more reach than our 25 ft and 30 ft listings without extending to 50 ft. Think about where the washer will sit and whether you need to work around vehicles, steps or corners.

Check hose diameter

Its 5/16 in inside diameter differs from the 1/4 in and 3/8 in products in this catalog. Diameter is one part of system suitability; check the washer’s flow requirements and specified hose dimensions before ordering.

Verify both end connections

The listing identifies an M22-threaded connection family. M22 threads can have different internal insert dimensions and seals; verify the precise connector configuration at both ends and whether your washer needs an adapter. An M22 label alone is not a fit guarantee.

Respect water and temperature limits

This listing identifies cold-water use and gives a maximum temperature of 140°F (manufacturer MorFlex specification). Do not use it for hot-water operation without explicit manufacturer approval.

Compare a meaningful alternative

The 40226 is a 50 ft MorFlex option with the same listed diameter and pressure rating; consider whether the extra 10 ft is useful.

View SIMPSON model 40226 specifications →

What to check before buying

Compatibility is not confirmed for your machine. Match the pressure rating, operating temperature, hose fitting type, fitting insert/seal dimensions, and the manufacturer’s washer-specific guidance. Do not infer fitment from thread name alone.