Choose the right nozzle orifice size
To use the chart below, find your PSI in the top row, scan down to your GPM, the the far right, you'll find the ORIFICE size you need for your machine.
To use the chart below, find your PSI in the TOP row. Scan down to your closest GPM. Choose the exact or higher GPM> Scan right to the ORIFICE SIZE column. Buy an nozzle with an ORIFCE that size or LARGER. Never buy a nozzle with a smaller orifice. It will break your machine.
| 1500 | 2000 | 2500 | 3000 | 3500 | 4000 | 4500 | 5000 | 5500 | 6000 | 6500 | 7000 | 7500 | 8000 | Orifice Size |
| 1.2 | 1.4 | 1.6 | 1.7 | 1.9 | 2 | 2.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2 |
| 1.6 | 1.8 | 2 | 2.2 | 2.3 | 2.5 | 2.7 | 2.8 | 2.9 | 3.1 | 3.2 | 3.3 | 3.4 | 3.5 | 2.5 |
| 1.8 | 2.1 | 2.4 | 2.6 | 2.8 | 3 | 3.2 | 3.4 | 3.5 | 3.7 | 3.8 | 4 | 4.1 | 4.2 | 3 |
| 2.2 | 2.5 | 2.8 | 3.1 | 3.3 | 3.5 | 3.7 | 3.9 | 4.1 | 4.3 | 4.5 | 4.6 | 4.8 | 4.9 | 3.5 |
| 2.5 | 2.8 | 3.2 | 3.5 | 3.7 | 4 | 4.2 | 4.5 | 4.7 | 4.9 | 5.1 | 5.3 | 5.5 | 5.7 | 4 |
| 2.8 | 3.2 | 3.6 | 3.9 | 4.2 | 4.5 | 4.8 | 5 | 5.3 | 5.5 | 5.7 | 6 | 6.2 | 6.4 | 4.5 |
| 3.1 | 3.5 | 4 | 4.3 | 4.7 | 5 | 5.3 | 5.6 | 5.9 | 6.1 | 6.4 | 6.6 | 6.8 | 7.1 | 5 |
| 3.4 | 3.9 | 4.3 | 4.8 | 5.1 | 5.5 | 5.8 | 6.2 | 6.4 | 6.7 | 7 | 7.3 | 7.5 | 7.8 | 5.5 |
| 3.7 | 4.2 | 4.7 | 5.2 | 5.6 | 6 | 6.4 | 6.7 | 7 | 7.3 | 7.6 | 7.9 | 8.2 | 8.5 | 6 |
| 4 | 4.6 | 5.1 | 5.6 | 6.1 | 6.5 | 6.9 | 7.3 | 7.6 | 8 | 8.3 | 8.6 | 8.9 | 9.2 | 6.5 |
| 4.3 | 4.9 | 5.5 | 6.1 | 6.5 | 7 | 7.4 | 7.8 | 8.2 | 8.6 | 8.9 | 9.3 | 9.6 | 9.9 | 7 |
| 4.6 | 5.3 | 5.9 | 6.5 | 7 | 7.5 | 8 | 8.4 | 8.8 | 9.2 | 9.6 | 9.9 | 10.3 | 10.6 | 7.5 |
| 4.9 | 5.7 | 6.3 | 6.9 | 7.5 | 8 | 8.5 | 8.9 | 9.4 | 9.8 | 10.2 | 10.6 | 11 | 11.3 | 8 |
| 5.21 | 6.01 | 6.72 | 7.36 | 7.95 | 8.5 | 9.02 | 9.5 | - | - | - | - | - | - | 8.5 |
| 5.5 | 6.4 | 7.1 | 7.8 | 8.4 | 9 | 9.6 | 10.1 | 10.6 | 11 | 11.5 | 11.9 | 12.3 | 12.7 | 9 |
| 5.82 | 6.72 | 7.51 | 8.23 | 8.89 | 9.5 | 10.08 | 10.62 | - | - | - | - | - | - | 9.5 |
| 6.1 | 7.1 | 7.9 | 8.7 | 9.4 | 10 | 10.6 | 11.2 | 11.7 | 12.2 | 12.7 | 13.2 | 13.7 | 14.1 | 10 |
| 6.74 | 7.78 | 8.7 | 9.53 | 10.29 | 11 | 11.67 | 12.3 | - | - | - | - | - | - | 11 |
| 7.3 | 8.5 | 9.5 | 10.4 | 11.2 | 12 | 12.7 | 13.4 | 14.1 | 14.7 | 15.3 | 15.9 | 16.4 | 17 | 12 |