Specification Parameters
| Operating Fluid | Air |
| Type | Pneumatic Fittings |
| Proof Pressure | 1.32 MPa (13.5 kgf/cm²) |
| Max. Operating Pressure | 0~0.9 MPa (0~9.2 kgf/cm²) |
| Ambient & Fluid Temperature | 0~60°C |
| Applicable Tubing | PU Tube, Nylon Tube |
| Model | ØD × 2 | B | ØP× 2 |
| PU-4 | 4 | 32 | 11 |
| PU-6 | 6 | 35.5 | 13 |
| PU-8 | 8 | 37.5 | 15 |
| PU-10 | 10 | 44 | 18.5 |
| PU-12 | 12 | 47.5 | 21 |
| PU-14 | 14 | 49 | 23.5 |
| PU-16 | 16 | 53.5 | 25.5 |
Key Features
- Straight union (tube-to-tube) design
- Push-to-connect quick installation
- Inline connection without direction change
- Leak-proof sealing with O-ring
- Reusable and easy disconnection
👉 Straight union fittings are used to connect two tubes in the same direction within pneumatic systems
Applications
- Pneumatic automation systems
- Air compressor pipelines
- Industrial machinery
- Robotics systems
- Packaging and assembly equipment
Widely used in pneumatic systems requiring inline tube extension, simple pipeline connection, and stable airflow transmission.
Product Function
PU fittings are designed to connect two pneumatic tubes directly in a straight line, allowing extension or repair of air pipelines without changing direction.
👉 Simple structure comparison:
Product Structure & Size Range
- PU4 / PU6 / PU8 / PU10 / PU12 / PU14 / PU16
- Tube sizes: 4mm → 16mm
- Equal union (same size both ends)
- Inline straight connection
Why Choose Our Pneumatic Fittings
- Professional PU pneumatic fitting manufacturer with full size range
- OEM / ODM customization for straight union push to connect fitting projects
- Reliable pneumatic tube connector for automation and compressed air systems
- High-quality air fitting factory China with strict QC system
- Durable push-in pneumatic fitting for stable airflow applications
- Fast delivery and global B2B supply support
FAQ
Q1: What is a PU pneumatic fitting?
It is a straight union push-to-connect fitting used to connect two air tubes in pneumatic systems.
Q2: What is a straight union fitting used for?
It is used to extend or connect tubing in a straight line without changing direction.
Q3: How does a push-to-connect fitting work?
The tube is inserted into the fitting and locked by internal gripping teeth, while an O-ring provides sealing
Q4: What is the working pressure of PU fittings?
Typical working pressure is 0–1.0 MPa depending on size and material
Q5: Can PU fittings be customized?
Yes, OEM/ODM customization is available for size, material, and structure.
