Part Number: 7659
Category: Pressure Washer Accessories → Spray Nozzles → High-Pressure Spray Nozzles
Type: PNR 1/8" MNPT 25° 4.0 Stainless Steel Spray Nozzle – Pressure Washer Replacement Nozzle

The PNR Stainless Steel Spray Nozzle (Part #7659) is a genuine OEM high-pressure replacement nozzle engineered for commercial, industrial, agricultural, and residential pressure washing applications. Featuring a 25-degree fan spray pattern and a 4.0 orifice, this nozzle delivers an excellent balance of cleaning power and surface coverage, making it ideal for general-purpose pressure washing, equipment maintenance, fleet washing, and building exterior cleaning.

Key Features & Benefits

• Genuine PNR OEM high-pressure spray nozzle
• Part Number: 7659
• Versatile 25° fan spray pattern
• 4.0 orifice size
• 1/8" MNPT connection
• Manufactured from AISI 416 stainless steel
• Precision-machined for consistent spray performance
• Corrosion and wear resistant
• Excellent balance of cleaning power and coverage
• Ideal for commercial and industrial pressure washing
• OEM-quality construction for long service life

Technical Specifications

Part Number: 7659

Manufacturer: PNR

Product Type: High-Pressure Spray Nozzle

Thread Size: 1/8" MNPT

Spray Pattern: 25°

Orifice Size: 4.0

Nozzle Size: 4.0

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
• Commercial pressure washers
• Industrial cleaning equipment
• Fleet washing
• Heavy equipment cleaning
• Concrete and masonry cleaning
• Agricultural equipment cleaning
• General-purpose pressure washing

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

Function of the Spray Nozzle

The PNR 7659 spray nozzle helps:

• Produce a controlled 25° high-pressure fan spray
• Deliver strong cleaning performance with moderate surface coverage
• Remove dirt, grease, mud, mildew, and grime from a variety of surfaces
• Maintain consistent operating pressure and water flow
• Improve cleaning efficiency for everyday pressure washing applications

Its 25° spray pattern is one of the most versatile nozzle angles available, making it suitable for routine cleaning of concrete, equipment, vehicles, siding, and other durable surfaces.

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 consumption caused by nozzle wear

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 1/8" MNPT connection and 4.0 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 4.0 orifice size to your pressure washer's GPM and PSI specifications to maintain proper operating pressure and maximize cleaning performance. The 25° spray pattern offers an excellent balance of cleaning force and coverage for most general-purpose pressure washing applications.

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 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.