304 Stainless Steel Close Nipple – 3/8" NPT Schedule 40 Pipe Fitting
Part Number: 5222
Category: Pressure Washer Parts & Accessories → Pressure Washer Fittings → Pipe Nipples
Type: 304 Stainless Steel Close Nipple – 3/8" NPT Schedule 40 Pipe Fitting
The 304 Stainless Steel Close Nipple (Part #5222) is a heavy-duty Schedule 40 pipe fitting designed to connect two 3/8-inch female NPT (FPT) threaded components with minimal added length. Manufactured from 304 stainless steel, this close nipple offers excellent corrosion resistance, durability, and reliable performance in pressure washing, industrial plumbing, soft wash, water transfer, and general fluid handling systems.
Key Features & Benefits
- Part Number: 5222
- 304 stainless steel construction
- 3/8" male NPT (MPT) threads
- Close-length (minimal extension) design
- Schedule 40 pipe fitting
- Rated for up to 800 PSI
- Excellent corrosion and rust resistance
- Compact design for tight installations
- Heavy-duty construction for commercial and industrial use
- Suitable for water and compatible low-pressure fluid applications
Technical Specifications
Part Number: 5222
Product Type: Close Nipple Pipe Fitting
Material: 304 Stainless Steel
Thread Size: 3/8" MPT x 3/8" MPT
Pipe Schedule: Schedule 40
Length: Close
Maximum Working Pressure: 800 PSI
Compatible Applications
Ideal for use with:
- Pressure washer plumbing systems
- Soft wash equipment
- Low-pressure water transfer systems
- Industrial plumbing
- Agricultural sprayers
- Chemical application systems (compatible fluids)
- Washdown equipment
- General-purpose piping installations
- Replacement plumbing connections
Function of the Close Nipple
The 5222 Stainless Steel Close Nipple joins two compatible 3/8" female NPT fittings while adding minimal overall length to the plumbing assembly. It helps to:
- Connect threaded plumbing components securely
- Maintain consistent fluid flow
- Create compact plumbing layouts
- Reduce potential leak points
- Provide a durable, corrosion-resistant connection
Its close-length design makes it ideal where installation space is limited.
Common Signs Replacement Is Needed
Replace the fitting if you notice:
- Corrosion or rust
- Stripped or damaged threads
- Cracks or physical damage
- Persistent leaks at threaded connections
- Excessive wear from repeated installation
- Thread deformation preventing a secure seal
Replacing a worn fitting helps maintain a safe, leak-free plumbing system.
Installation & Service Notes
Turn off the system and relieve all pressure before installing the fitting.
Apply an approved PTFE thread seal tape or compatible thread sealant to the 3/8" MPT threads, then thread the 5222 Close Nipple into compatible 3/8" FPT components. Tighten securely using appropriate tools without over-tightening, and inspect the assembly for leaks before returning the system to service.
Important: This fitting is designed for low-pressure applications with a maximum working pressure of 800 PSI. Always verify compatibility with the connected plumbing components and operating conditions before installation.
Maintenance Recommendations
- Inspect periodically for corrosion, wear, or damaged threads.
- Check threaded connections regularly for leaks.
- Reapply thread sealant whenever the fitting is removed and reinstalled.
- Keep fittings clean and free of debris or chemical buildup.
- Replace the fitting if corrosion, thread damage, or leaks develop.
- Operate only within the maximum pressure rating of 800 PSI to ensure safe, reliable performance and extended service life.
