McMaster 5635K75 Opaque Yellow, 3/8" ID, 1/2" OD Hard Nylon Plastic Tubing for Air and Water

This general purpose tubing has hard walls, yet is flexible enough for gradual bends. It has excellent strength and durability.

Nylon tubing can handle lower temperatures than polypropylene tubing and can withstand higher pressures. It has slightly softer walls than polypropylene tubing, making it more flexible and impact absorbent.

Opaque tubing doesn’t allow you to see what’s flowing through the line.