# PU PC Pneumatic Fittings Air Tube Connector Guide

Date: 2026-05-05
Categories: Blogs
URL: https://homipneu.com/pneumatic-fitting-types-explained-full-guide-to-air-tube-connectors.html

### ![pneumatic fitting types straight elbow tee bulkhead connectors](https://homipneu.com/wp-content/uploads/2026/04/20260429033703254671-800x533.webp)

### Main Types of [Pneumatic Fittings](https://homipneu.com/tag/pneumatic-fittings)

Type
Example
Function

Straight Fittings
[PU](https://homipneu.com/product/pneumatic-fittings/pu-pneumatic-straight-union.html) / [PC](https://homipneu.com/product/pneumatic-fittings/pc-pneumatic-straight-fitting-series.html)
Connect tubes in a straight line

Elbow Fittings
[PL](https://homipneu.com/product/pneumatic-fittings/pl-pneumatic-elbow-fitting.html) / [PV](https://homipneu.com/product/pneumatic-fittings/pv-pneumatic-elbow-fitting.html)
Change direction (90°)

[Tee Fittings](https://homipneu.com/tag/tee-fittings)
[PE](https://homipneu.com/product/pneumatic-fittings/pe-pneumatic-t-type-tee-fitting.html) / [PY](https://homipneu.com/product/pneumatic-fittings/py-pneumatic-y-type-tee-fitting.html)
Split airflow into two directions

Cross Fittings
[PZA](https://homipneu.com/product/pneumatic-fittings/pza-pneumatic-cross-fitting.html)
Split airflow into multiple directions

Bulkhead Fittings
[PM](https://homipneu.com/product/pneumatic-fittings/pm-pneumatic-bulkhead-union.html) / [PLM](https://homipneu.com/product/pneumatic-fittings/plm-pneumatic-bulkhead-elbow.html) / [PMF](https://homipneu.com/product/pneumatic-fittings/pmf-pneumatic-fitting.html)
Pass tubes through panels

Valves
[PA](https://homipneu.com/product/pneumatic-fittings/pa-pneumatic-inline-valve.html) / [HVSS](https://homipneu.com/product/pneumatic-fittings/hvss-pneumatic-hand-valve.html) / [HVFF](https://homipneu.com/product/pneumatic-fittings/hvff-pneumatic-hand-valve.html)
Control airflow

### Straight Pneumatic Fittings

Straight fittings are used to **connect two tubes or a tube to a threaded port in a straight line**.

Common types:

- PU → tube to tube

- PC → tube to thread

Best for:

- Simple connections

- Pipeline extension

- Low complexity systems

### Elbow Pneumatic Fittings

Elbow fittings allow tubing to **change direction (usually 90°)**.

Common types:

- PL → threaded elbow

- PV → tube-to-tube elbow

Best for:

- Space-saving installations

- Direction change in piping

### Tee Pneumatic Fittings

Tee fittings are used to **split airflow into two branches**.

Common types:

- PE → T-type (90° branch)

- PY → Y-type (angled branch, smoother flow)

Best for:

- Airflow branching

- Distribution systems

### Cross Pneumatic Fittings

Cross fittings allow **four-way air distribution** in complex systems.

Common type:

- PZA → 4-way connector

Best for:

- Multi-line air distribution

- Complex pneumatic circuits

### Bulkhead Pneumatic Fittings

Bulkhead fittings are used to **route tubing through panels or enclosures**.

Common types:

- PM → bulkhead straight

- PLM → bulkhead elbow

- PMF → bulkhead female

Best for:

- Panel-mounted systems

- Clean and organized layout

### Pneumatic Valves

Pneumatic valves are used to **control airflow, pressure, and direction**.

Common types:

- PA → inline valve

- HVSS → shut-off valve

- HVFF → shut-off with exhaust

Best for:

- Airflow control

- System safety

- Maintenance isolation

### Applications

- Industrial automation systems

- Air compressor pipelines

- Robotics and assembly lines

- Packaging machinery

- Manufacturing equipment

Pneumatic fittings are used in systems requiring **air distribution, flexible piping layout, and reliable sealing performance**.

### How to Choose the Right Pneumatic Fitting

**1. Connection Type**

- Tube ↔ Tube → PU / PV / PE / PY

- Tube ↔ Thread → PC / PL

**2. Direction Requirement**

- Straight → PU

- 90° → PL / PV

- Multi-branch → PE / PY / PZA

**3. Installation Environment**

- Panel mount → PM / PLM / PMF

- Inline control → PA

**4. System Complexity**

- Simple → straight / elbow

- Complex → tee / cross

### Why Choose Our Pneumatic Fittings

- Full range of **pneumatic fitting types** available

- OEM / ODM customization for **industrial air connector solutions**

- Reliable **push-to-connect fittings for automation systems**

- High-quality **pneumatic fitting manufacturer with strict QC system**

- Durable **[air tube](https://homipneu.com/tag/air-tube) connectors for long-term industrial use**

- Fast delivery and global B2B supply support

### FAQ

**Q1: What are pneumatic fittings used for?**They are used to connect, route, and control airflow in compressed air systems.

**Q2: What is the most common pneumatic fitting?**Push-to-connect fittings are the most widely used due to easy installation.

**Q3: What is the difference between elbow and tee fittings?**Elbow fittings change direction, while tee fittings split airflow.

**Q4: What is a bulkhead fitting used for?**It allows tubing to pass through panels or enclosures.

**Q5: How do I choose the right pneumatic fitting?**Consider connection type, direction, pressure, and system layout.

👉 [Explore our Pneumatic Fittings series for more options.](https://homipneu.com/product/pneumatic-fittings)