SIMPSON Professional Pressure Washer Spray Gun 80178
5,075 PSI · 12.0 GPM · 212°F.
The SIMPSON 80178 is a replacement spray gun for hot- or cold-water machines rated up to 5,075 PSI. Its hose side is 3/8 in FNPT and its wand side is 1/4 in FNPT, so check both ends of your setup before ordering.
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Specifications at a glance
| Brand | SIMPSON |
|---|---|
| Model | 80178 |
| Max pressure | 5,075 PSI |
| Max flow | 12.0 GPM |
| Max temperature | 212°F (hot or cold water) |
| Hose connection | 3/8 in FNPT |
| Wand/lance connection | 1/4 in FNPT |
| Included | M22 and quick-connect adapters |
| Warranty | 90-day limited accessory |
From SIMPSON’s product information. Fields SIMPSON doesn’t state are left out or marked “Verify”.
What to know about the 80178
Connection chain
Threaded NPT at both ends (3/8 in FNPT hose, 1/4 in FNPT wand). SIMPSON includes M22 and quick-connect adapters for other hoses.
Hot-water use
Rated to 212°F, so it suits hot-water machines; pair it with a hose and wand rated for the same temperature, such as the 48-inch insulated wand 80179.
Key features (from SIMPSON)
- Rated to 5,075 PSI and 12.0 GPM
- Hot- or cold-water use up to 212°F
- 3/8 in FNPT hose inlet and 1/4 in FNPT wand outlet
- M22 and quick-connect adapters included
Works with (by connection type)
Matched on the connection and rating data on this site. Always check the exact fitting before ordering.
Wand (1/4 in MNPT)
Hot-water hoses (via the included quick-connect adapter - check size)
Is it right for you?
| Good choice if | you run a hot-water machine (rated to 212°F) |
|---|---|
| Good choice if | your washer is rated at or below 5,075 PSI |
| Look elsewhere if | your hose or wand uses a different thread and you don't want adapters |
Questions about the 80178
Can I use the SIMPSON 80178 with a hot-water pressure washer?
Yes - SIMPSON rates it to 212°F for hot- or cold-water use.
What connections does the 80178 have?
Hose connection: 3/8 in FNPT; wand/lance connection: 1/4 in FNPT. Check the matching part on your gun, hose or wand before ordering.
What pressure washer ratings does the 80178 support?
Up to 5,075 PSI and 12.0 GPM, according to SIMPSON.
What to check before buying
Source and editorial status
Manufacturer reference: SIMPSON product information ↗. Specifications checked 1 November 2026. We have not tested this product.