Easy and convenient to install. Fit to use with 5mm aquarium air line tubing. Protect you air pump by preventing aquarium water from back siphoning during a power outage. Place?in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Total Size: 27 x 8mm/1.1" x 0.3"(L*Max.Dia); Material: Plastic