SIMPSON Monster 80398 — 50 ft pressure washer hose

3/8-inch inside diameter · rated up to 4,500 PSI · cold-water use.

50 ft4,500 PSI3/8 in ID

The Monster 80398 is a 50-foot, 3/8-inch quick-connect cold-water hose rated to 4,500 PSI. It is not a direct threaded-M22 replacement: verify the quick-connect plug/socket dimensions and the washer’s rated operating pressure.

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Specifications at a glance

Brand	SIMPSON
Model	80398
Product line	Monster
Length	50 ft
Inside diameter	3/8 in
Maximum pressure	4,500 PSI
Water application	Cold
Connection family	3/8 in quick connect — verify plug/socket
Maximum temperature	140°F

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

What to know about this hose

The SIMPSON Monster 80398 is listed as a 50-foot hose with a 3/8 in inside diameter and a maximum pressure rating of 4,500 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

The 50 ft length may reduce how often you need to move the washer across a larger work area, but it also means more hose to route and store. Keep the hose away from sharp edges, vehicle traffic and hot surfaces.

Check hose diameter

This is a 3/8 in inside-diameter hose, unlike the smaller MorFlex options listed here. Check the pressure washer’s recommended hose diameter and required connections rather than assuming a larger hose is always an upgrade.

Verify both end connections

The listing describes 3/8 in quick-connect fittings. Verify whether your equipment requires a plug or socket at each end, as well as the actual coupler size and pressure rating. A 3/8 in label alone is not proof of fit.

Respect water and temperature limits

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

Compare a meaningful alternative

The Armor 41114 is also listed as 50 ft, 3/8 in and 4,500 PSI, but its hot/cold-water designation differs. Verify connection and temperature needs.

View SIMPSON model 41114 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.