Nozzle size
Nozzle size 4.0: 0.052 in orifice, chart flows and DEWALT tips
A size 4.0 nozzle: its 0.052 in orifice, 4.00 GPM at 4,000 PSI, 3.46 at 3,000 and about 2.83 at 2,000 on General Pump's chart, and DEWALT's 4,500 PSI tips.
Also listed as 4.0 nozzle, 040 nozzle, size 4 orifice, 4-25 nozzle
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Short answer
A size 4.0 nozzle has a 0.052 in orifice. General Pump's chart gives 4.00 GPM at 4,000 PSI, about 3.46 GPM at 3,000 PSI and about 2.83 GPM at 2,000 PSI, so the same nozzle passes far less water on a lower-pressure machine. DEWALT sells size 4.0 tips (DXPA45ST) and a size 4.0 turbo nozzle (DXPA45TN), both on a 1/4 in quick-connect and rated to 4,500 PSI. A '4-25' stamp means size 4 with a 25-degree fan.
Key facts
- Flow at common pressures
- 4.00 GPM at 4,000 PSI, about 3.46 GPM at 3,000 PSI and about 2.83 GPM at 2,000 PSI (General Pump chart)[1][3]Cat Pumps' chart gives 2.80 GPM at 2,000 PSI; the difference is rounding. Reference-chart values, not measured output of any machine.
- Parts made in this size
- DEWALT DXPA45ST five-tip set (0, 15, 25, 40 degrees and soap) and DXPA45TN turbo nozzle, both 1/4 in quick-connect and rated to 4,500 PSI[4][5]DEWALT gives no GPM range for them.
- Machines makers pair it with
- Active recommends nozzle sizes 3.5 to 5.0 for its Active 2.0, a range that includes 4.0[6]Active's guidance for the Active 2.0 only; no other maker read pairs size 4.0 with a named machine.
- Spray angle
- Separate from size: Cat Pumps says the size and angle are both stamped on a nozzle, so a '4-25' is size 4 with a 25-degree fan, and angle does not affect flow[2][3]
- Wear
- Cat Pumps says worn nozzles are the most frequent cause of low pressure; replace a worn nozzle with the proper size, and never adjust the pressure regulating valve to make up for it[7]
- Not confirmed
- Not confirmedDEWALT's GPM range and hot-water limit for its size 4.0 tips; any maker pairing beyond Active's range.
Watch out for
- On General Pump's chart, a size 4.0 nozzle flows 4.00 GPM at 4,000 PSI but only about 2.83 GPM at 2,000 PSI; read the flow at your machine's rated pressure, not the size number alone.
- DEWALT rates its size 4.0 tips and turbo nozzle to 4,500 PSI and its size 3.0 parts to 3,400 PSI; check the part's rating against your machine.
- Use paired working values (flow at that pressure) for the formula, not a headline maximum PSI with a maximum GPM.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
Nozzle set, size 4.0
DEWALT DXPA45ST 4,500 PSI quick-connect spray tips, 5 tips, size 4.0, stainless steelChoose the DXPA45ST set in orifice size 4.0.
DEWALT states orifice size 4.0 for all five tips.
Nozzle set, size 4.0
SIMPSON 80146 1/4 in quick-connect nozzle set, 5 tips, size 4.0, 4,500 PSIChoose the five-tip set in orifice size 4.0.
SIMPSON states orifice size 4.0 for all five 1/4 in QC tips.
Turbo nozzle, size 4.0
SIMPSON 80144 universal turbo nozzle, 1/4 in quick connect, size 4.0, 4,500 PSIChoose the turbo nozzle in orifice size 4.0.
SIMPSON states orifice size 4.0 on a 1/4 in QC plug.
Questions
How much does a size 4.0 nozzle flow at 3,000 PSI?
About 3.46 GPM on General Pump's chart, against 4.00 GPM at 4,000 PSI and about 2.83 GPM at 2,000 PSI. See the nozzle size chart.[1]
What do the numbers on a 4-25 nozzle mean?
Cat Pumps says the nozzle number and spray angle are both stamped on a nozzle: a '4-25' is size 4 with a 25-degree fan, with a 0.052 in orifice that flows 4.0 GPM at 4,000 PSI.[2]
Should I adjust my machine if a size 4.0 nozzle feels weak?
No. Cat Pumps says worn nozzles are the most frequent cause of low pressure and warns never to adjust the pressure regulating valve to compensate, because that can over-pressurize and damage the pump. Replace the nozzle with the proper size. See low or pulsing pressure.[7]