Part Number: 1001
Category: Pressure Washer Accessories → Variable & Adjustable Spray Nozzles
Type: MV Hi-Lo Variable Pressure Washer Nozzle – 4.0 Orifice Adjustable Spray Nozzle

The Mecline MV Hi-Lo Variable Pressure Washer Nozzle (Part #1001) is a genuine OEM adjustable spray nozzle designed for commercial, industrial, agricultural, and residential pressure washing applications. Featuring a 4.0 orifice and an adjustable Hi-Lo spray pattern, this nozzle allows operators to quickly switch between high-pressure cleaning and low-pressure chemical application without changing nozzles, improving productivity and reducing downtime.

Key Features & Benefits

• Genuine Mecline OEM variable pressure nozzle
• Part Number: 1001
• Adjustable Hi-Lo spray operation
• 4.0 orifice size
• Rated for up to 3,200 PSI
• Supports flow rates up to 8 GPM
• Maximum operating temperature of 300°F
• 1/4" FPT threaded inlet
• Quickly switches between high- and low-pressure operation
• Ideal for detergent application and pressure washing
• Blue identification dot for easy recognition
• Durable OEM construction for long service life

Technical Specifications

Part Number: 1001

Manufacturer: Mecline

Product Type: Hi-Lo Variable Pressure Nozzle

Nozzle Size: 4.0

Inlet Thread: 1/4" FPT

Maximum Pressure: 3,200 PSI

Maximum Flow Rate: 8 GPM

Maximum Temperature: 300°F

Identification Dot: Blue

OEM Replacement: Yes

Compatible Applications

Suitable for use with:

• Pressure washer spray guns
• Pressure washer spray wands
• Commercial pressure washers
• Residential pressure washers
• Hot and cold water pressure washers
• Vehicle and fleet washing
• Equipment cleaning
• Agricultural equipment maintenance
• Building exterior cleaning
• Concrete and general-purpose pressure washing
• Detergent and chemical application

Always verify nozzle size, operating pressure, flow rate, and thread compatibility before ordering.

Function of the Hi-Lo Variable Nozzle

The Mecline MV Hi-Lo nozzle helps:

• Switch quickly between high-pressure cleaning and low-pressure chemical application
• Eliminate the need to change nozzles during cleaning jobs
• Improve cleaning efficiency and productivity
• Apply detergents and rinse surfaces with a single adjustable nozzle
• Maintain consistent spray performance during demanding cleaning tasks

Its adjustable design makes it an excellent choice for professionals who frequently alternate between washing and detergent application.

Common Signs Replacement Is Needed

Replace the nozzle if you notice:

• Difficulty adjusting between high and low pressure
• Reduced cleaning performance
• Internal leakage
• Uneven or inconsistent spray pattern
• Worn internal components
• Damaged threads
• Excessive wear affecting pressure or detergent application

Replacing a worn nozzle restores proper pressure control, spray performance, and cleaning efficiency.

Installation & Service Notes

• Turn off the pressure washer and relieve system pressure before installation.
• Verify compatibility with the 1/4" FPT inlet and 4.0 nozzle size.
• Install the nozzle securely without overtightening the threads.
• Adjust the nozzle between high- and low-pressure modes as needed during operation.
• Inspect seals and threads regularly for wear or damage.
• Replace the nozzle if adjustment becomes difficult or spray performance declines.

Important: Match the 4.0 orifice size to your pressure washer's GPM and PSI specifications to maintain proper operating pressure and cleaning performance. This adjustable nozzle is designed to simplify pressure washing by allowing rapid transitions between high-pressure cleaning and low-pressure detergent application without changing accessories.

Maintenance Recommendations

• Flush the nozzle thoroughly with clean water after each use, especially after using detergents or chemicals.
• Inspect the adjustment mechanism periodically for smooth operation.
• Clean mineral deposits or debris from the nozzle as needed.
• Store the nozzle in a clean, dry location when not in use.
• Use only genuine OEM Mecline replacement parts to maintain proper spray performance, pressure control, and long-term reliability.