When you're setting up a pneumatic system, the hose you pick can make the difference between a smooth run and constant leaks. In the hoses tubing fittings aisle, two polyurethane options stand out: a compact blue 8mm line and a long, transparent 6x4mm reel built for larger runs. Let's break it down by price, length, and the jobs each hose handles best.
Quick Verdict
If you mainly work at a single station, the blue 8mm line is the practical pick. If you need to cover distance and watch the flow, the transparent 6x4mm tubing is the stronger choice.
Comparison Table
| Feature | Blue 8mm PU Line Hose | Transparent 6x4mm PU Tubing |
|---|---|---|
| Price | $20.95 | $92.30 |
| Length | 39 ft (12 m) | 50 m |
| Material | Polyurethane (PU) | Polyurethane (PU) |
| Color | Blue | Transparent |
| Outside Diameter | 0.31" (approx 8mm) | 6mm |
Where Each Wins
The blue 8mm line suits short, simple connections-like a pneumatic tool at a bench. If your setup is static and close to the compressor, the blue line keeps things tidy. It's also more portable for small water or gardening tasks. The transparent 6x4mm tubing wins for long-distance runs, robotics, and pneumatic control systems. Its operating pressure of 0-1 MPa and burst pressure of 3 MPa make it a solid choice for pressurized air, water, and lubricating oil.
Blue 8mm PU Line Hose
This blue PU line is priced at $20.95, giving you a lower-cost way to get a 39-foot run for a single station. It's made from crystal-clear PU that resists yellowing and cracking, and it's suited for pneumatic tools, instruments, mechanical gas pipelines, laboratory automation, and even general water and gardening work. That versatility makes it a handy spare to keep around. The high resilience and crease-resistant behavior mean it should handle repeated bending without kinking, which is a plus for tight setups. The clear limitation is the length: 39 feet (about 12 meters) is enough for a bench, but not for running across a workspace or connecting distant equipment. And since it's blue, you can't see the flow, which matters if you need to spot blockages.
Transparent 6x4mm Flexible Tubing
This transparent reel is the larger investment at $92.30, and it delivers a full 50 meters of hose. That's roughly four times the length of the blue line, which is why it's ideal for robotics, pneumatic control systems, or any project with equipment spread across a room. The specs back it up: operating pressure of 0-1 MPa and a burst pressure of 3 MPa, with compatibility for air, water, and lubricating oil. The see-through material lets you monitor flow and spot bubbles easily. The working temperature range of -15°C to +60°C adds flexibility for varied environments. The downside is the price tag and the fixed 6mm x 4mm size; if you only need a few feet, you'll be paying for a lot of surplus hose.
Final Choice by Use Case
For a compact, low-investment setup, go with the blue 8mm PU line hose. For a long, pressure-rated run with visual feedback, the transparent 6x4mm flexible tubing is the one to buy.
