Part Number: 7638
Category: Pressure Washer Accessories → Spray Nozzles → High-Pressure Spray Nozzles
Type: PNR 1/4" MNPT 15° 15.0 Stainless Steel Spray Nozzle – Pressure Washer Replacement Nozzle

The PNR Stainless Steel Spray Nozzle (Part #7638) is a genuine OEM high-pressure replacement nozzle engineered for commercial, industrial, agricultural, and heavy-duty pressure washing applications. Featuring a 15-degree fan spray pattern and a 15.0 orifice, this nozzle delivers high water flow with a concentrated spray for powerful cleaning performance on large-capacity pressure washer systems.

Key Features & Benefits

• Genuine PNR OEM high-pressure spray nozzle
• Part Number: 7638
• Concentrated 15° fan spray pattern
• 15.0 orifice size for high-flow applications
• 1/4" MNPT connection
• Manufactured from AISI 416 stainless steel
• Precision-machined for consistent spray performance
• Corrosion and wear resistant
• Excellent for removing heavy dirt, grease, and grime
• Ideal for commercial and industrial pressure washing
• OEM-quality construction for long service life

Technical Specifications

Part Number: 7638

Manufacturer: PNR

Product Type: High-Pressure Spray Nozzle

Thread Size: 1/4" MNPT

Spray Pattern: 15°

Orifice Size: 15.0

Nozzle Size: 15.0

Material: AISI 416 Stainless Steel

OEM Replacement: Yes

Compatible Applications

Suitable for use with:

• Pressure washer spray guns
• Pressure washer spray wands
• Pressure washer lances
• High-flow commercial pressure washers
• Industrial cleaning equipment
• Heavy equipment cleaning
• Concrete and masonry cleaning
• Agricultural equipment cleaning
• Fleet washing
• General-purpose pressure washing

Always verify the thread size, nozzle size, operating pressure, flow rate, and machine specifications before ordering.

Function of the Spray Nozzle

The PNR 7638 spray nozzle helps:

• Produce a concentrated 15° high-pressure fan spray
• Deliver high water flow with aggressive cleaning power
• Remove stubborn dirt, grease, oil, mud, and heavy buildup
• Maintain consistent operating pressure and water flow
• Improve cleaning productivity on commercial and industrial jobs

Its 15° spray pattern and 15.0 orifice make it ideal for high-flow pressure washer systems requiring concentrated cleaning force for demanding industrial, agricultural, construction, and fleet maintenance applications.

Common Signs Replacement Is Needed

Replace the nozzle if you notice:

• Uneven or distorted spray pattern
• Reduced cleaning pressure
• Worn or enlarged orifice
• Clogged nozzle
• Damaged threads
• Corrosion or physical damage
• Increased water flow caused by nozzle wear resulting in pressure loss

Replacing a worn nozzle restores proper spray pattern, operating pressure, and cleaning efficiency.

Installation & Service Notes

• Turn off the pressure washer and relieve system pressure before replacing the nozzle.
• Verify compatibility with the 1/4" MNPT connection and 15.0 orifice size.
• Install the nozzle securely without overtightening the stainless steel threads.
• Inspect the nozzle seat and threads for debris before installation.
• Test the spray pattern after installation to verify proper operation.
• Replace the nozzle if wear causes pressure loss or an inconsistent spray pattern.

Important: Match the 15.0 orifice size to your pressure washer's GPM and PSI specifications to maintain proper operating pressure and cleaning performance. The 15° spray pattern is intended for durable surfaces and heavy-duty cleaning applications. Use caution when cleaning painted finishes, soft wood, delicate materials, or other surfaces that may be damaged by concentrated pressure.

Maintenance Recommendations

• Flush the nozzle with clean water after each use.
• Inspect the orifice regularly for mineral deposits, debris, or wear.
• Clean clogged nozzles using an approved nozzle cleaning tool—avoid using wire or sharp objects that may enlarge or damage the precision orifice.
• Store the nozzle in a clean, dry location when not in use.
• Use only genuine OEM replacement nozzles to maintain proper spray pattern, operating pressure, and long service life.