Tubing and PVC for Aquarium Plumbing

Aquarium tubing, aka flexible vinyl tubing, comes in different colors and sizes. The tubing is measured based on the inner diameter of the tubing. Aquarium hose barbs are measured based on the size aquarium tubing they accept. So, 1 inch flexible tubing has a 1 inch inner diameter and fits on a 1 inch hose barb.

Flexible PVC pipe connects to standard slip PVC fittings, not a hose barb. Flexible PVC connects like rigid or hard PVC pipe, but flexes a lot like flexible tubing.

Aquarium tubing is different from the airline tubing used with an aquarium air pump.
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