Union Straight Push To Connect Fitting

Join Two Pneumatic Tubes in a Straight, Removable Connection

PU Series push-to-connect fittings are designed to join two compatible pneumatic tubes in a straight line without a threaded equipment port in compressed air and pneumatic automation systems. This category sits within PneumaticHub's Push To Connect Inch Tube Fittings range and is intended for inch outside-diameter pneumatic tubing.

The one-touch fitting design allows compatible polyurethane, nylon and other suitable pneumatic tubing to be installed quickly and removed for maintenance when the system is safely depressurized. The fitting geometry is especially useful for machines and pneumatic circuits built around inch-size tubing.

Download Push-In Fittings Datasheet

Operating Specifications

Fluid medium: Air
Working pressure: 0–150 psi(g) / 10 bar(g)
Proof pressure: 450 psi(g) / 30 bar(g)
Vacuum duty: 29.5 inHg / 14 mbar(a)
Working temperature: 32–140°F / 0–60°C

Why Use This Union Straight Fitting?

A straight union is useful for extending tubing, repairing a line or creating a serviceable connection between two tube sections.

Push-to-connect tube installation helps reduce assembly time compared with many conventional tube-connection methods.

Key Benefits

Tubing can be disconnected and reconnected for maintenance or machine changes when the circuit is safely depressurized.
Compact bodies help keep pneumatic plumbing organized around valves, cylinders, manifolds and control panels.
Correct selection should consider tube outside diameter on each side and required flow.

Common Applications

Industrial automation machinery
Pneumatic cylinders and actuators
Directional control valves and manifolds
Packaging and assembly equipment
Robotics and material handling
OEM pneumatic equipment
General factory compressed air systems

Frequently Asked Questions

What is a union straight push to connect fitting used for?

It is used to join two compatible pneumatic tubes in a straight line without a threaded equipment port in a pneumatic circuit. The exact connection arrangement depends on the model and the surrounding tubing or threaded components.

How does the push-to-connect connection work?

Compatible pneumatic tubing is pushed into the fitting until the internal gripping and sealing components retain it. The tube can be released using the fitting collar after the system has been safely depressurized.

What tubing is commonly used with these fittings?

The source category identifies polyurethane and nylon pneumatic tubing as common materials. Tube outside diameter and material should match the specific fitting.

What is the listed working pressure?

The source specification lists a working pressure of 0–150 psi(g) / 10 bar(g).

What is the listed proof pressure?

The source specification lists a proof pressure of 450 psi(g) / 30 bar(g).

Can these fittings be used for vacuum?

The source specification lists vacuum duty to 29.5 inHg / 14 mbar(a). Confirm the exact fitting, tubing and application conditions before use.

What is the listed working temperature?

The source specification lists 32–140°F / 0–60°C, with high-temperature models noted as available on request.

How do I choose the correct union straight push to connect fitting?

Confirm tube outside diameter on each side and required flow, as well as pressure, temperature and tubing compatibility before ordering.