Install these aquarium airline valves as an in-line valve to control air flow from your air pump. Two-way
valves are manufactured from high-quality, non-corrosive plastic material.
I admit I wasn't expecting much when I ordered these, but the price was right. I was surprised when they got here, and they actually were very precise in adjustment of air flow. My airline tubing fit snugly and didn't slide off easily, I guess because of the textured surface. These are a good buy!