Part Number: 7678
Category: Pressure Washer Accessories → Spray Nozzles → High-Pressure Spray Nozzles
Type: PNR 1/4" MNPT 0° 3.0 Stainless Steel Spray Nozzle – Pressure Washer Replacement Nozzle

The PNR Stainless Steel Spray Nozzle (Part #7678) is a genuine OEM high-pressure replacement nozzle designed for commercial, industrial, agricultural, and residential pressure washing applications. Featuring a 0-degree straight-stream spray pattern and a 3.0 orifice, this nozzle delivers a highly concentrated stream for maximum cleaning impact on lower- to mid-flow pressure washer systems. It is ideal for removing stubborn dirt, grease, mud, paint residue, and heavy buildup from durable surfaces.

Key Features & Benefits

• Genuine PNR OEM high-pressure spray nozzle
• Part Number: 7678
• Concentrated 0° straight-stream spray pattern
• 3.0 orifice size
• 1/4" MNPT connection
• Manufactured from AISI 416 stainless steel
• Precision-machined for consistent spray performance
• Corrosion and wear resistant
• Maximum cleaning force for targeted applications
• Ideal for commercial and industrial pressure washing
• OEM-quality construction for long service life

Technical Specifications

Part Number: 7678

Manufacturer: PNR

Product Type: High-Pressure Spray Nozzle

Thread Size: 1/4" MNPT

Spray Pattern: 0°

Orifice Size: 3.0

Nozzle Size: 3.0

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
• Residential pressure washers
• Industrial cleaning equipment
• Heavy equipment cleaning
• Concrete and masonry cleaning
• Agricultural equipment cleaning
• Surface preparation and spot cleaning

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

Function of the Spray Nozzle

The PNR 7678 spray nozzle helps:

• Produce a concentrated 0° high-pressure straight stream
• Deliver maximum cleaning force with precise targeting
• Remove stubborn dirt, grease, mud, paint residue, and heavy buildup
• Maintain consistent operating pressure and water flow
• Improve cleaning efficiency for demanding spot-cleaning applications

Its 0° spray pattern and 3.0 orifice are ideal for lower- to mid-flow pressure washer systems requiring maximum cleaning intensity on tough contaminants and durable surfaces.

Common Signs Replacement Is Needed

Replace the nozzle if you notice:

• Reduced cleaning power
• Distorted or inconsistent spray stream
• 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 performance, 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 3.0 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 stream after installation to verify proper operation.
• Replace the nozzle if wear causes pressure loss or an inconsistent spray stream.

Important: Match the 3.0 orifice size to your pressure washer's GPM and PSI specifications to maintain proper operating pressure and cleaning performance. The 0° spray pattern produces maximum concentrated force and should only be used on durable surfaces. Avoid using it on painted finishes, vehicles, wood, glass, soft materials, or any surface that could be damaged by a concentrated high-pressure stream.

Maintenance Recommendations

• Flush the nozzle with clean water after each use.
• Inspect the orifice regularly for mineral buildup, 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.