What are the different air line fittings?
Pneumatic Fittings Types
- Quick release couplings:
- Schrader Coupling and Plug.
- PCL Standard Airflow Coupling and Plug.
- PCL Standard Vertex Coupling.
- PCL Standard Safety Coupling.
- PCL Twin Standard Y Coupling.
- Uni Hi Flow Coupling and Plug.
- Hose Tails.
Can I use compression fittings on air brake lines?
Because of the unreliability of compression fittings on brake lines, the use of compression fittings is not widely recommended. If you are repairing the brake lines in a vehicle that is not a passenger car used for everyday road travel and transportation, compression fittings are an acceptable brake line repair.
What are the two types of air couplings?
There are two main types of air compressor couplers : Automotive and Industrial. The chart below shows how to identify which connector style you have. As you can see, Industrial style couplers have two striped going across the fitting, whereas the automotive style only has one.

Is PCL XF the same as Euro?
Commonly referred to as Euro, the XF-Euro series boasts excellent flow characteristics, providing the workshop with increased airflow when required, giving enhanced tool efficiency.
Why are compression fittings illegal on brake lines?
One of the most important reasons to avoid brake line compression fittings is their tendency to crack under extreme pressure, which will inevitably lead to brake system failure. Second, the law in your state might prohibit the use of these fittings for brake line repair.
Can I splice a brake line?

Contrary to popular belief it is NOT illegal to make a new section of brake line and splice it into a non-rusted section of your old brake, as long as you use automotive grade SAE double/inverted flare, SAE “bubble” flare and DIN Single Mushroom flare unions and fittings.
What size threads are air fittings?
Thread sizes are typically 1/8″, 1/4″, 3/8″, 1/2″ or 3/4″ pipe thread. A fitting that has female pipe threads (FPT) can only mate to something with male pipe threads (MPT) that are of the same pipe thread size. Nominal – the inner diameter size that the compressed air passes through.
What size are air line fittings?
There are many different types of air fittings but most air tools use one of just a few types of connector. The main things to consider are the fitting type and the thread size. Common fixing types include ¼” BSP, ¼” PCL and 3/8” NPT.