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Flexible Tubing

Flexible tubing, which is usually vinyl, attaches to a hose barb. Aquarium tubing is measured by inner diameter, the hole size on the inside of the tubing. Clear flexible tubing allows you to see water flow inside the tubing, but can harbor algae over time. Although you cannot see through black vinyl tubing, it does prevent algae growth.

Note: flexible tubing and flexible PVC are not the same. Flexible PVC cannot attach to a hose barb. Flexible PVC is just like rigid PVC pipe, which glues into standard slip fittings.

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