Mosmatic 57.051 DYG Carbide Seal Swivel – 1/4" FPT x 1/4" MPT Stainless Steel
Part Number: 57.051
Category: Pressure Washer Parts → Swivels & Fittings
Type: Mosmatic 57.051 DYG Carbide Seal Rotary Union Swivel – 1/4" FPT x 1/4" MPT Stainless Steel, 4000 PSI
The Mosmatic 57.051 DYG Carbide Seal Rotary Union Swivel is a genuine Mosmatic premium rotary union designed for professional pressure washing, industrial cleaning, automatic wash systems, surface cleaners, spray equipment, and other high-pressure rotating fluid transfer applications. Featuring a 1/4-inch Female NPT inlet and 1/4-inch Male NPT outlet, this precision-engineered swivel provides smooth 360-degree continuous rotation while maintaining unrestricted water flow under pressure.
Key Features & Benefits
- Genuine Mosmatic OEM rotary union
- Manufacturer Model: 57.051
- DYG series rotary union
- Premium carbide seal technology
- 1/4" Female NPT inlet
- 1/4" Male NPT outlet
- Smooth 360° continuous rotation
- Premium stainless steel construction
- Precision bearing system
- Maintenance-free design
- Rated for systems up to 4,000 PSI
- Maximum operating temperature: 250°F
- Excellent corrosion resistance
- Designed for continuous-duty commercial and industrial applications
- Maintains unrestricted fluid flow while rotating
Technical Specifications
Manufacturer: Mosmatic
Manufacturer Model: 57.051
Series: DYG
Product Type: Rotary Union Swivel
Inlet Connection: 1/4" Female NPT
Outlet Connection: 1/4" Male NPT
Maximum Working Pressure: 4,000 PSI
Maximum Temperature: 250°F
Body Material: Stainless Steel
Seal Material: Tungsten Carbide
Swivel Rotation: 360°
OEM Replacement: Yes
Compatible Applications
Suitable for use with:
- Commercial pressure washers
- Industrial pressure washing systems
- Surface cleaners
- Automatic vehicle wash equipment
- Spray guns
- Rotary cleaning equipment
- Wash booms
- High-pressure hose assemblies
- Industrial spray systems
- High-pressure fluid transfer equipment
Always verify thread size, pressure rating, temperature rating, and equipment compatibility before ordering.
Function of the Rotary Union
The Mosmatic 57.051 DYG Rotary Union helps:
- Provide smooth 360° continuous rotation
- Maintain unrestricted high-pressure water flow
- Prevent hose twisting and kinking
- Reduce stress on hoses and plumbing components
- Improve equipment maneuverability
- Extend the service life of hoses, spray equipment, and connected components
Its tungsten carbide seal provides exceptional durability and long-lasting leak resistance in demanding high-pressure applications.
Common Signs Replacement Is Needed
Replace the rotary union if you notice:
- Water leaking around the swivel body
- Restricted or rough swivel rotation
- Excessive rotational play
- Damaged or worn threads
- Corrosion or physical damage
- Reduced swivel performance under pressure
Replacing a worn rotary union restores smooth operation and helps protect connected equipment from unnecessary wear.
Installation & Service Notes
Turn off the pressure washer or equipment and relieve all system pressure before installation.
Apply an appropriate thread sealant to the 1/4" Female NPT connection where required and connect the 1/4" Male NPT outlet to the mating component.
Tighten all threaded connections securely without overtightening.
Verify smooth rotation and inspect the system for leaks before placing the equipment into service.
Important: Never exceed the maximum 4,000 PSI working pressure or 250°F operating temperature. Always verify compatibility with your pressure washer system and connected accessories before installation.
Maintenance Recommendations
- Inspect the rotary union regularly for leaks and smooth rotation.
- Keep the swivel clean and free of dirt, debris, and mineral buildup.
- Inspect sealing surfaces during routine maintenance.
- Replace worn seals or damaged components promptly.
- Verify threaded connections remain secure during operation.
- Use only genuine OEM Mosmatic replacement parts to maintain proper fit, reliable performance, and maximum service life.
