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Feature

Product name : air check valve; use for : aquarium, fish tank
Color: black, clear;material: plastic
Hole Outer Diameter: 4. 5mm/ 0. 177";Overall Size: 42 x 10mm/ 1. 65" x 0. 39" (L*Max. D)
Weight : 4g
Package contents : 1 air check valve

Description

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.