Mosmatic 59.163 DYT Rotary Union Swivel – 3/8" FPT x G3/8" Male Stainless Steel

Part Number: 59.163
Category: Pressure Washer Parts → Swivels & Fittings
Type: Mosmatic 59.163 DYT Rotary Union Swivel – 3/8" FPT x G3/8" Male Stainless Steel, 5000 PSI

The Mosmatic 59.163 DYT Rotary Union Swivel is a genuine Mosmatic premium rotary union engineered for demanding pressure washing, industrial cleaning, vehicle wash systems, rotating equipment, and high-pressure fluid transfer applications. Designed with a 3/8-inch Female NPT inlet and G3/8-inch Male (BSPP) outlet, this precision rotary union delivers smooth 360-degree continuous rotation while maintaining unrestricted fluid flow under high pressure and high rotational speeds.

Key Features & Benefits

• Genuine Mosmatic OEM rotary union
• Part Number: 6925
• Manufacturer Model: 59.163
• DYT series high-speed rotary union
• 3/8" Female NPT inlet
• G3/8" Male (BSPP) outlet
• Smooth 360° continuous rotation
• Premium stainless steel construction
• Rated for systems up to 5,000 PSI
• Supports rotational speeds up to 2,000 RPM
• Maximum operating temperature: 250°F
• Excellent corrosion resistance
• Designed for continuous-duty industrial applications
• Maintains full fluid flow while rotating
• Reduces hose twisting and mechanical stress

Technical Specifications

Manufacturer: Mosmatic

Manufacturer Model: 59.163

Series: DYT

Product Type: Rotary Union Swivel

Inlet Connection: 3/8" Female NPT

Outlet Connection: G3/8" Male (BSPP)

Maximum Working Pressure: 5,000 PSI

Maximum Speed: 2,000 RPM

Maximum Temperature: 250°F

Body Material: Stainless Steel

Swivel Rotation: 360°

OEM Replacement: Yes

Compatible Applications

Suitable for use with:

• Commercial pressure washers
• Industrial pressure washing systems
• Automatic vehicle wash equipment
• Rotary cleaning equipment
• Surface cleaners
• High-speed rotating equipment
• Wash booms
• Industrial fluid transfer systems
• Manufacturing equipment
• High-pressure spray systems

Always verify thread type, operating pressure, rotational speed, and equipment compatibility before ordering. G3/8 is a BSPP (British Standard Parallel Pipe) thread and is not interchangeable with NPT threads without the proper adapter.

Function of the Rotary Union

The Mosmatic 59.163 DYT Rotary Union helps:

• Provide smooth 360° continuous rotation
• Maintain unrestricted high-pressure fluid flow
• Reduce hose twisting and kinking
• Minimize stress on plumbing components
• Support high-speed rotating equipment up to 2,000 RPM
• Extend the service life of hoses and connected equipment

Its precision-engineered rotary union design is built for demanding continuous-duty applications requiring both high pressure and high rotational speed.

Common Signs Replacement Is Needed

Replace the rotary union if you notice:

• Water leaking around the swivel body
• Restricted or rough rotation
• Excessive rotational play
• Damaged or worn threads
• Corrosion or physical damage
• Reduced performance under pressure or high-speed operation

Replacing a worn rotary union restores reliable performance and helps prevent damage to connected equipment.

Installation & Service Notes

Turn off the pressure washer or equipment and relieve all system pressure before installation.

Apply an appropriate thread sealant to the 3/8" Female NPT connection where required. The G3/8 (BSPP) outlet typically seals with a gasket or O-ring and should not be treated as an NPT thread unless specified by the equipment manufacturer.

Tighten all threaded connections securely without overtightening.

Verify smooth rotation and inspect the system for leaks before returning equipment to service.

Important: Never exceed the maximum 5,000 PSI working pressure, 2,000 RPM rotational speed, or 250°F operating temperature. Always verify compatibility with your equipment and thread type 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 proper thread engagement during installation.
• Use only genuine OEM Mosmatic replacement parts to maintain proper fit, dependable performance, and long-term service life.