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Our Nozzle Size Selection Chart is easy to use. The ideal nozzle size is determined by the pressure washer's GPM (gallons per minute) at a specific PSI (pounds per square inch). Look across the top row to determine the PSI that your pressure washer operates. Follow that column down to the nearest GPM of your pressure washer. Then, follow that over to the far left hand column to determine the appropriate nozzle size. EXAMPLE: Find 2000 PSI on the top row. Drop down that column to 3.89 GPM. Follow that across to the left hand column and you'll see that a pressure washer operating at 2000 PSI at approximately 4 GPM (3.89) would require a size 5.5 nozzle.
Nozzle Size Pounds Per Square Inch (PSI)


500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4500 5000
2
0.71 0.87 1.00 1.12 1.22 1.32 1.41 1.50 1.58 1.66 1.73 1.80 1.87 1.94 2.00 2.12 2.24
2.5
0.88 1.08 1.25 1.40 1.53 1.65 1.77 1.88 1.98 2.07 2.17 2.25 2.34 2.42 2.50 2.65 2.80
3
1.06 1.30 1.50 1.68 1.84 1.98 2.12 2.25 2.37 2.49 2.60 2.70 2.81 2.90 3.00 3.18 3.35
3.5
1.24 1.52 1.75 1.96 2.14 2.32 2.47 2.63 2.77 2.90 3.04 3.15 3.27 3.39 3.50 3.71 3.91
4
1.41 1.73 2.00 2.24 2.45 2.65 2.83 3.00 3.16 3.32 3.46 3.61 3.74 3.87 4.00 4.24 4.47
4.5
1.59 1.95 2.25 2.52 2.76 2.98 3.18 3.38 3.56 3.73 3.90 4.06 4.21 4.36 4.50 4.77 5.03
5
1.77 2.17 2.50 2.80 3.06 3.31 3.54 3.75 3.95 4.15 4.33 4.51 4.68 4.84 5.00 5.30 5.59
5.5
1.94 2.38 2.75 3.07 3.37 3.64 3.89 4.13 4.35 4.56 4.76 4.96 5.14 5.33 5.50 5.83 6.15
6
2.12 2.60 3.00 3.35 3.67 3.97 4.24 4.50 4.74 4.97 5.20 5.41 5.61 5.81 6.00 6.36 6.71
6.5
2.30 2.81 3.25 3.63 3.98 4.30 4.60 4.88 5.14 5.39 5.63 5.86 6.08 6.29 6.50 6.89 7.27
7
2.47 3.03 3.50 3.91 4.29 4.63 4.95 5.25 5.53 5.80 6.06 6.31 6.55 6.78 7.00 7.42 7.83
7.5
2.65 3.25 3.75 4.19 4.59 4.96 5.30 5.63 5.93 6.22 6.50 6.76 7.02 7.26 7.50 7.95 8.39
8
2.83 3.46 4.00 4.47 4.90 5.29 5.66 6.00 6.32 6.63 6.93 7.21 7.48 7.75 8.00 8.49 8.94
8.5
3.01 3.68 4.25 4.75 5.21 5.62 6.01 6.38 6.72 7.05 7.36 7.66 7.95 8.23 8.50 9.02 9.50
9
3.18 3.90 4.50 5.03 5.51 5.95 6.36 6.75 7.12 7.46 7.79 8.11 8.42 8.71 9.00 9.55 10.06
9.5
3.36 4.11 4.75 5.31 5.82 6.28 6.72 7.13 7.51 7.88 8.23 8.56 8.89 9.20 9.50 10.08 10.62
10
3.54 4.33 5.00 5.59 6.12 6.61 7.07 7.50 7.91 8.29 8.66 9.01 9.35 9.68 10.00 10.61 11.18
11
3.89 4.76 5.50 6.15 6.74 7.28 7.78 8.25 8.70 9.12 9.53 9.92 10.29 10.65 11.00 11.67 12.30
12
4.24 5.20 6.00 6.71 7.35 7.94 8.49 9.00 9.49 9.95 10.39 10.82 11.22 11.62 12.00 12.73 13.42
12.5
4.42 5.41 6.25 6.99 7.65 8.27 8.84 9.38 9.88 10.36 10.83 11.27 11.69 12.10 12.50 13.26 13.98
13
4.60 5.63 6.50 7.27 7.96 8.60 9.19 9.75 10.28 10.78 11.26 11.72 12.16 12.59 13.00 13.79 14.53
15
5.30 6.50 7.50 8.39 9.19 9.92 10.61 11.25 11.86 12.44 12.99 13.52 14.03 14.52 15.00 15.91 16.77
20
7.07 8.66 10.00 11.18 12.25 13.23 14.14 15.00 15.81 16.58 17.32 18.03 18.71 19.36 20.00 21.21 22.36
25
8.84 10.83 12.50 13.98 15.31 16.54 17.68 18.75 19.76 20.73 21.65 22.53 23.39 24.21 25.00 26.52 27.95
30
10.61 12.99 15.00 16.77 18.37 19.84 21.21 22.50 23.72 24.87 25.98 27.04 28.06 29.05 30.00 31.82 33.54
40
14.14 17.32 20.00 22.36 24.49 26.46 28.28 30.00 31.62 33.17 34.64 36.06 37.42 38.73 40.00 42.43 44.72
50
17.68 21.65 25.00 27.95 30.62 33.07 35.36 37.50 39.53 41.46 43.30 45.07 46.77 48.41 50.00 53.03 55.90
60
21.21 25.98 30.00 33.54 36.74 39.69 42.43 45.00 47.43 49.75 51.96 54.08 56.12 58.09 60.00 63.64 67.08