Package Include : soda bottle adapter*2 + clear T-connector*2 + clear Y-connector*2 + check valve*2 + control valve*2 + airline tubing*4 yds
You only need 2 pcs empty soda bottles and air pump,and you can get 2 brine shrimp hatcheries!
Include 4 yard air tubing(3/16''),cut according to your actual needs.
Bigger soda bottle will be made a bigger hatchery,I think this is better than premade hatchery.