Pneumatic systems move compressed air from the compressor to actuators, valves, and other controls. The tubing that carries that air needs to match your fittings and handle the pressures your system produces. Two black polyurethane (PU) air lines are on the table here: a 1/8" OD line listed at $9.75 and a 5/32" OD line listed at $12.83. Both are sold in 32.8-ft rolls, but their diameters and pressure ratings lead to different use cases.
Quick Verdict
If you need a 1/8" outer diameter line and want the lower listed price, choose the 1/8" OD tubing at $9.75. If you need a 5/32" outer diameter line and can work with its listed specs, the 5/32" OD tubing at $12.83 is the one for you.
Shared Features
Both lines are black polyurethane tubing in 32.8-ft rolls. Each is aimed at pneumatic control applications, and both list pressure and temperature information. The shared length makes the price comparison straightforward: the 5/32" line lists at $12.83 and the 1/8" line at $9.75.
Comparison Table
| Option | Listed price | Price bar | Key specs |
|---|---|---|---|
| 5/32" OD PU Air Line | USD 12.83 | 5/32" OD (4mm), 2.5mm ID, 32.8-ft roll | |
| 1/8" OD PU Air Line | USD 9.75 | 1/8" OD, 32.8-ft roll, max pressure 363 psi |
Where Each Product Wins
- The 1/8" OD line has the lower listed price ($9.75 vs $12.83) and lists a maximum pressure of 363 psi.
- The 5/32" OD line is the one with a stated inner diameter (2.5mm ID) and a 5/32" (4mm) OD.
The 1/8" line's 363 psi max pressure is its main talking point; the 5/32" line's 2.5mm ID is its main draw.
The Decision Driver
The outer diameter is the main fit consideration. A 5/32" (4mm) OD line and a 1/8" (0.13-inch) OD line are not interchangeable in the same fitting. So your fitting size determines which product to buy. The price spread of $3.08 between the two listings is small relative to the fit mismatch.
Product Notes
#### Pneumatic Tubing 5/32" OD 33ft 4mm OD 2.5mm ID PU Air Line Pipe Black
Listed at $12.83, this Zaplyte line is the higher-priced option of the two. It comes in a 32.8-ft roll and is made from polyurethane. The title and description agree on the 5/32" (4mm) outer diameter and the 2.5mm inner diameter, so you know both dimensions before you buy. The listing also includes a temperature range of -5 to 50°C and a pressure resistance value of 10kg. Note that the product carries a California Prop 65 warning. This line is the match for systems that use 5/32" (4mm) OD fittings and for anyone who wants a stated inner diameter to plan around.
#### 1/8" OD Pneumatic Tubing Pipe, Black PU Air Brake Hose Line for Air Compressor F
This is the lower-priced line at $9.75. It is sold as a 32.8-ft roll (393.6 inches) of black polyurethane tubing. The outer diameter is 1/8" (0.13 inches), which is the more compact size in this pairing. The listing states a maximum pressure of 363 psi and an operating temperature range of -4°F to 176°F. Since the 1/8" OD is the main dimension given, your fittings need to match that size. Choose this line when your system is built around 1/8" connectors and you want the lower listed price.
Final Choice by Use Case
- Choose the 1/8" OD line when your fittings are 1/8" and you want the lower listed price.
- Choose the 5/32" OD line when your fittings are 5/32" (4mm) and you need the stated 2.5mm ID.
