PU STRAIGHT PU UNION - SPU

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SPU Pneumatic Union Straight Push-In Connector

The images featuring the SPU designation show a Union Straight fitting. This is the simplest type of connector in a push-to-connect pneumatic system, designed to extend or repair air lines.

Product Description

Name: Union Straight, Union Coupler, or Straight Push-In Connector (often designated SPU in catalogs).
Function: This fitting is used to connect two lengths of pneumatic tubing of the same outer diameter (OD) in a straight line.
Mechanism: It features two identical push-to-connect ports on opposite ends. Tubing is inserted into each port until seated to create a secure, airtight connection.
Primary Purpose:
- Extending a Line: Used when a single piece of tubing is not long enough to reach the destination.
- Repairing a Line: Used to splice two good ends of tubing together after a damaged section has been cut out.
Key Design Features:
- Push-to-Connect: Allows for fast, tool-free installation.
- Quick Release Collar: A simple press on the colored release ring/collar allows the tubing to be quickly removed.
- Mounting Feature: One variant shown includes a flange or hole in the center, allowing the union to be panel-mounted or secured to a surface for strain relief and neatness.
Material and Sealing:
- Typically made from a durable thermoplastic body (e.g., PBT).
- Features an internal O-ring seal to prevent leaks and a collet (gripping claw) to firmly hold the tubing.