Choosing pneumatic tubing is about matching the line to your fittings, the material to the task, and the length to the run. This guide compares one 50-foot aluminum refrigeration tube with three polyurethane compressor lines.
Quick Take
- Need a metal refrigeration line? The Robertshaw 11-193 is the 50-foot aluminum tube with a 1/4-inch outside diameter and a 90 psi working pressure.
- Want a general-purpose PU line? The blue 5/16-inch PU compressor line covers around 39 feet and is described for pneumatic tools, instruments, gas pipelines, and water.
- Working on pneumatic controls? The Zaplyte black PU air line is the middle-sized 5/32-inch option.
- Want the lowest listed price? The black PU air brake line lists 363 psi max pressure and comes in at USD 9.75.
Price Comparison
| Product | Listed price | Price bar |
|---|---|---|
| Robertshaw 11-193 Aluminum Refrigeration Tubing | USD 31.69 | |
| Blue PU Compressor Line | USD 20.95 | |
| Zaplyte Black PU Air Line | USD 12.83 | |
| Black PU Air Brake Line | USD 9.75 |
Decision Matrix
- Material. The Robertshaw is the only aluminum line; the other three are polyurethane.
- Outside diameter. The PU lines vary from 1/8 inch up to 5/16 inch, and the Robertshaw uses a 1/4-inch OD, so fitting size should drive the pick.
- Use case. The Robertshaw is tied to refrigeration. The blue PU line is tied to pneumatic tools and general industrial runs. The Zaplyte line is tied to pneumatic control systems. The black PU line is tied to air brake hose and air compressor work.
- Pressure. The black PU line lists 363 psi max pressure; the Robertshaw lists 90 psi working pressure.
Product Notes
Robertshaw 11-193 Aluminum Refrigeration Tubing (50 Ft, 1/4 In)
Choosing between metal and PU starts with knowing the equipment you are feeding. If you work in refrigeration, the Robertshaw 11-193 is the line explicitly described for that service. It is a 50-foot aluminum tube with a 1/4-inch outside diameter and a 90 psi working pressure. The listed price is USD 31.69, the highest of the four, and the California Prop 65 warning shown is N. The aluminum material separates it from the PU options, but you are paying for that metal and the longer 50-foot run.
Blue PU Compressor Line (5/16 In OD, 39 Ft)
Among the three polyurethane tubes, the blue line has the widest outside diameter at 5/16 inch. It is listed at USD 20.95 and has a length around 39 feet, which puts it between the 50-foot aluminum line and the shorter PU tubes. The description ties it to pneumatic tools, instruments, mechanical gas pipelines, and general industrial water and gardening use, so it reads like a multi-purpose line. If your fittings are in the 5/16-inch range, this is the one to pair with them. It is not the least expensive PU tube in this set, though; the black air brake line is priced lower at USD 9.75.
Zaplyte Black PU Air Line (5/32 In OD)
Zaplyte's black line is the middle ground among the PU options. It uses a 5/32-inch outside diameter and a 2.5-mm inner diameter, and the title also gives the outer dimension as 4mm, so the sizing is consistent. The listed price is USD 12.83, which places it below the blue line and above the black air brake line. The description mentions compressed-air delivery for pneumatic control systems, which makes it a sensible choice for industrial automation lines. It is also the only product in this group with a California Prop 65 warning for Cancer and Reproductive Harm. If you need a compact, middle-sized PU tube rather than the smallest or widest, this is the one.
Black PU Air Brake Line (1/8 In OD, 32.8 Ft)
The black air brake line is both the least expensive and the narrowest tube in this comparison, with a listed price of USD 9.75 and an outside diameter of 1/8 inch. Its title points to air brake hose and air compressor work, and it is the only one of the four lines that lists a maximum pressure: 363 psi. The line is supplied as a 32.8-foot tube. If your fittings are in the 1/8-inch range and you want a pressure number to plan around, this is the product to start with. The trade-off is that the compact OD makes it best suited for smaller-diameter air lines rather than the wider industrial runs covered by the blue PU line.
Final Thoughts
For refrigeration, choose the Robertshaw 11-193 aluminum line. For a general-purpose PU tube, go with the blue compressor line. For pneumatic control systems, the Zaplyte black line fits the described work. For the lowest listed price and a stated max pressure, pick the black PU air brake line. Match the outside diameter to your fittings first, and the material and length follow.
