SIMPSON · Parts by washer
Parts that fit the SIMPSON MegaShot MSH3125-S
3,200 PSI · 2.5 GPM · 1/4 in M22 hose · size 3 nozzle. Which replacement parts match it, which need a check, and which don't fit.
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MSH3125-S specs that decide fit
| Spec | Value | Source |
|---|---|---|
| Rated pressure | 3,200 PSI | SIMPSON spec sheet |
| Rated flow | 2.5 GPM | SIMPSON spec sheet |
| Engine | Honda GC190 | SIMPSON spec sheet |
| Pump | OEM Technologies axial cam | SIMPSON spec sheet |
| Hose | MorFlex 1/4 in x 25 ft, M22 | SIMPSON spec sheet |
| Gun connections | Threaded M22 | Dealer listing of SIMPSON specs |
| Wand | 16 in steel, quick connect + threaded M22 | OPE Reviews spec list |
| Nozzles | 5 quick-connect tips: 0°, 15°, 25°, 40°, soap | SIMPSON product page |
| California | 49-state model; SIMPSON says it does not ship to CA | SIMPSON spec sheet |
What to know before you buy parts
- SIMPSON sells this machine as MSH3125-S online and MSH3125 in stores (part number 60551). Parts on this page apply to both.
- The stock hose is 1/4 in. A 5/16 in MorFlex replacement is a common upgrade: it is rated higher (3,700 PSI) and loses less pressure over long runs.
Nozzle size for the MSH3125-S
Using the standard formula (nozzle number = GPM × √(4000 ÷ PSI)), 2.5 GPM at 3,200 PSI works out to 2.80, so the nearest standard tip is size 3. Work out other ratings with our nozzle size calculator.
Below: 12 good matches, 7 to check first and 9 that don't fit, checked against the 3,200 PSI / 2.5 GPM rating and the connection types above.
Replacement hoses
| Fit | Part | Why | |
|---|---|---|---|
| Check first | MorFlex 40224 — 25 ft pressure washer hose | 1/4 in, rated 3,300 PSI (100 PSI headroom). Thread type matches; confirm the M22 insert size (14 or 15 mm). | Check price |
| Check first | MorFlex 80391 — 30 ft pressure washer hose | 1/4 in, rated 3,300 PSI (100 PSI headroom). Thread type matches; confirm the M22 insert size (14 or 15 mm). | Check price |
| Check first | MorFlex 40225 — 25 ft pressure washer hose | 5/16 in, rated 3,700 PSI (500 PSI headroom). Thread type matches; confirm the M22 insert size (14 or 15 mm). | Check price |
| Check first | MorFlex 80392 — 40 ft pressure washer hose | 5/16 in, rated 3,700 PSI (500 PSI headroom). Thread type matches; confirm the M22 insert size (14 or 15 mm). | Check price |
| Check first | MorFlex 40226 — 50 ft pressure washer hose | 5/16 in, rated 3,700 PSI (500 PSI headroom). Thread type matches; confirm the M22 insert size (14 or 15 mm). | Check price |
| Not a match | Monster 41113 — 25-foot pressure washer hose | 3/8 in quick-connect ends; this washer uses M22 threaded fittings. | Check price |
| Not a match | Monster 41028 — 50-foot pressure washer hose | 3/8 in quick-connect ends; this washer uses M22 threaded fittings. | Check price |
| Not a match | Monster 41030 — 100-foot pressure washer hose | 3/8 in quick-connect ends; this washer uses M22 threaded fittings. | Check price |
| Not a match | Armor 41114 — 50 ft pressure washer hose | 3/8 in quick-connect ends; this washer uses M22 threaded fittings. | Check price |
| Not a match | Armor 41096 — 100-foot pressure washer hose | 3/8 in quick-connect ends; this washer uses M22 threaded fittings. | Check price |
Spray guns
| Fit | Part | Why | |
|---|---|---|---|
| Good match | Universal Pressure Washer Spray Gun 80147 | M22 at both ends, rated 3,400 PSI and 8.0 GPM. | Check price |
| Good match | Universal Pressure Washer Spray Gun with Side Assist Handle 80148 | M22 at both ends, rated 4,500 PSI. Side handle helps on long jobs. | Check price |
| Check first | Professional Pressure Washer Spray Gun 80178 | Professional hot-water gun (5,075 PSI, 12 GPM) with NPT threads; M22 and quick-connect adapters are included. More gun than most homeowners need. | Check price |
Wands
| Fit | Part | Why | |
|---|---|---|---|
| Good match | Universal 16-Inch Pressure Washer Wand 80149 | 16 in, M22 gun end and 1/4 in quick-connect nozzle end, rated 3,500 PSI. | Check price |
| Good match | Universal 31-Inch Pressure Washer Wand 80479 | 31 in, M22 gun end and 1/4 in quick-connect nozzle end, rated 4,500 PSI. | Check price |
| Check first | Pressure Washing Telescoping Wand 80470 | Telescopes 6–18 ft, rated 4,000 PSI and 8.0 GPM. Check its quick-connect and M22 adapter against your gun before ordering. | Check price |
| Not a match | Professional 48-Inch Insulated Pressure Washer Wand 80179 | 1/4 in MNPT gun end; it threads into NPT guns such as the 80178, not an M22 gun. | Check price |
Nozzles
| Fit | Part | Why | |
|---|---|---|---|
| Good match | SIMPSON nozzle set 80145 (size 3.0) | Size 3.0 matches this washer's calculated size of 3. | |
| Not a match | SIMPSON nozzle set 80146 (size 4.0) | Size 4.0; this washer needs about 3. A larger orifice than needed cuts cleaning pressure. | |
| Not a match | Twinkle Star Pressure Washer Nozzle Tips TWIS005 (Size 2.5) | Size 2.5; this washer needs about 3. A smaller orifice than needed pushes pressure above the rating. | Check price |
Surface cleaners
| Fit | Part | Why | |
|---|---|---|---|
| Good match | Universal 15-Inch Pressure Washer Surface Cleaner 80299 | 15 in, 1,500–3,700 PSI, 2.5+ GPM, 1/4 in quick-connect plug. | Check price |
| Good match | Universal 16.5-Inch Pressure Washer Surface Cleaner 80625 | 16.5 in, 2,000–4,000 PSI, 2.5+ GPM, 1/4 in quick-connect plug. | Check price |
| Not a match | Universal 20-Inch Industrial Pressure Washer Surface Cleaner 80182 | Needs at least 3,450 PSI; this washer makes 3,200 PSI. | Check price |
Foam cannons
| Fit | Part | Why | |
|---|---|---|---|
| Good match | High Pressure Foam Cannon 80271 | 1,600–4,000 PSI, 1/4 in quick-connect plug, 1 L bottle. | Check price |
Replacement pumps
| Fit | Part | Why | |
|---|---|---|---|
| Good match | OEM Technologies Axial Cam Pump Kit 90028 | 3,000 PSI at 2.4 GPM, 3/4 in shaft, M22 outlet. Matches this engine's 3/4 in shaft. | Check price |
| Good match | OEM Technologies Axial Cam Pump Kit 90029 | 3,300 PSI at 2.4 GPM, 3/4 in shaft, M22 outlet. Matches this engine's 3/4 in shaft. | Check price |
| Good match | AAA AX300 Axial Cam Pump Kit 90052 | 3,500 PSI at 2.5 GPM, 3/4 in shaft, M22 outlet. Matches this engine's 3/4 in shaft. | Check price |
| Good match | AAA Triplex Pump Kit 90036 | 3,200 PSI at 2.8 GPM, 3/4 in shaft, M22 outlet. Matches this engine's 3/4 in shaft. | Check price |
Similar pressure washers
Washers with the same nozzle size or a close pressure rating, where many of the same parts apply.
How we decide fit
A part is a good match when its pressure rating is at or above 3,200 PSI, its flow range covers 2.5 GPM and its connection matches the washer. “Check first” means the ratings match but one connection detail isn't published or varies between batches, such as M22 insert size. See M22 14 mm vs 15 mm.