Electric compact
1.4 GPM · 2,000 PSI
Orifice 2.0. Start with a 2.0 tip (25020 green for hardscape).
PSI + GPM
Tip orifice chart
A 25030 tip is a 25° fan with a 3.0 orifice. The first two digits are the angle. The last two are the hole. Size the hole to your pump, then pick the color for the surface.
Most homeowners land here. A 2.3–2.8 GPM gas washer around 2,800–3,200 PSI wants a
3.0 orifice — 25030 green for concrete, 15030 yellow for spots, 40030 white to rinse.
Electric 1.4 GPM @ 2,000 PSI is a 2.0. The calculator and table below confirm the hole;
they do not change the formula.
PSI + GPM → orifice
Orifice number ≈ GPM at 4,000 PSI. We solve for your machine, then snap to a common tip size.
Uses the stamped pump numbers — not the box art.
Recommended orifice 2.9
· start with a 3.0 tip
A smaller tip raises pressure and can chatter the unloader. A larger tip dumps pressure and the wash goes soft.
Why the orifice matters more than the box PSI
The pump wants a given flow at a given pressure. The tip is the restriction that lets it get there. Go too small and the unloader chatters, the hose jumps, and seals wear. Go too large and you lose the pressure you paid for.
Industry convention: the orifice number equals gallons per minute at 4,000 PSI. For any other machine:
orifice = GPM × √(4000 ÷ PSI)
Example: 2.5 GPM at 3,000 PSI → 2.5 × √(4000/3000) ≈ 2.9. Start with a 3.0 tip (25030 / 15030 / 40030).
Run the same equation the other way and you get flow: GPM = orifice × √(PSI ÷ 4000). If you already own a tip, the GPM chart shows what that hole passes at your PSI. The fan for the surface — concrete, siding, cars, decks — is the tip size chart.
Electric 1.4 GPM @ 2,000 PSI wants about a 2.0 orifice. Dropping a 4.0 “pro” tip on that
machine is why it feels like a garden hose.
Recommended orifice by PSI and GPM
Start with the three common bands. The full table is below — on a phone, scroll sideways; the GPM column stays put.
Most homeowners
2.5 GPM · 3,000 PSI
Orifice 2.9 → 3.0. Start with 25030 / 15030 / 40030.
Prosumer gas
4.0 GPM · 4,000 PSI
Orifice 4.0. A 3.0 tip on this pump will chatter the unloader.
Full chart: cells show calculated orifice, then the nearest common tip size in parentheses.
| GPM \ PSI | 1600 | 2000 | 2500 | 2800 | 3000 | 3500 | 4000 |
|---|---|---|---|---|---|---|---|
| 1.2 | 1.9 (2.0) | 1.7 (1.5) | 1.5 (1.5) | 1.4 (1.5) | 1.4 (1.5) | 1.3 (1.5) | 1.2 (1.5) |
| 1.4 | 2.2 (2.0) | 2.0 (2.0) | 1.8 (2.0) | 1.7 (1.5) | 1.6 (1.5) | 1.5 (1.5) | 1.4 (1.5) |
| 1.6 | 2.5 (2.5) | 2.3 (2.5) | 2.0 (2.0) | 1.9 (2.0) | 1.8 (2.0) | 1.7 (1.5) | 1.6 (1.5) |
| 2.0 | 3.2 (3.0) | 2.8 (3.0) | 2.5 (2.5) | 2.4 (2.5) | 2.3 (2.5) | 2.1 (2.0) | 2.0 (2.0) |
| 2.3 | 3.6 (3.5) | 3.3 (3.5) | 2.9 (3.0) | 2.7 (2.5) | 2.7 (2.5) | 2.5 (2.5) | 2.3 (2.5) |
| 2.5 | 4.0 (4.0) | 3.5 (3.5) | 3.2 (3.0) | 3.0 (3.0) | 2.9 (3.0) | 2.7 (2.5) | 2.5 (2.5) |
| 2.8 | 4.4 (4.5) | 4.0 (4.0) | 3.5 (3.5) | 3.3 (3.5) | 3.2 (3.0) | 3.0 (3.0) | 2.8 (3.0) |
| 3.5 | 5.5 (5.5) | 4.9 (5.0) | 4.4 (4.5) | 4.2 (4.0) | 4.0 (4.0) | 3.7 (3.5) | 3.5 (3.5) |
| 4.0 | 6.3 (6.0) | 5.7 (5.5) | 5.1 (5.0) | 4.8 (5.0) | 4.6 (4.5) | 4.3 (4.5) | 4.0 (4.0) |
| 5.0 | 7.9 (8.0) | 7.1 (8.0) | 6.3 (6.0) | 6.0 (6.0) | 5.8 (6.0) | 5.3 (5.5) | 5.0 (5.0) |
Then pick the fan color
Angle by job and PSI band is the tip size chart. Flow from a tip you already own is the GPM chart.
0° · Red
Pinpoint blast. Paint stripping, rust, never for siding or cars.
15° · Yellow
Heavy concrete, gum, oil spots. Keep it moving.
25° · Green
Everyday workhorse. Driveways, patios, most hardscape.
40° · White
Rinse, soap, and softer surfaces. Wide and forgiving.