Product Description
This is Festo's PUN-H 4mm x 50m polyurethane tubing (part 558278) — a flexible pneumatic pipe for compressed air, water and vacuum lines. It's not a CCTV part, but it turns up in workshops and installation vans alike where pneumatic tools or air-actuated equipment share space with camera kit, so we stock it as a general workshop consumable.
What it actually is
The tube has a 4mm outside diameter and 2.6mm inside diameter, made from 100% polyurethane, silver in colour, supplied as a single 50m length. It's rated for -0.95 to +10 bar operating pressure and works across -35°C to +60°C.
Why the "H" matters
The PUN-H designation means hydrolysis resistant — it holds up under water exposure, not just air, and Festo lists it as suitable for food industry applications and clean rooms. It's free of copper and PTFE, FDA compliant, and conforms to RoHS.
Fitting it
It's designed for push-in pneumatic fittings — push the tube in, and it locks with a one-click action, no tools or glue needed. Its flexibility also makes it suitable for energy chains and high-cycle pneumatic setups.
Before you order
Check your fitting size matches 4mm OD/2.6mm ID, and confirm your working pressure and temperature fall inside the ranges above before committing to a full 50m length.
Specifications
- Product Type
- FESTO-Compressed-Air-Pipe-Silver-PUN-H-Series-558278
Technical Specifications
Frequently Asked Questions
What size fittings does this tube need?
It has a 4mm outside diameter and 2.6mm inside diameter, so match push-in fittings to those measurements.
Can this tube be used with water, not just air?
Yes — the PUN-H designation means it's hydrolysis resistant, so Festo rates it for water and vacuum use as well as compressed air.
What pressure and temperature range can it handle?
It's rated from -0.95 to +10 bar and works between -35°C and +60°C.
Do I need special tools to fit it?
No — it's designed for push-in pneumatic fittings with a one-click installation, no tools required.
