Review on 🐠 Pawfly 3-Way Aquarium Air Flow Control Lever Valve Distributor Splitter Pump Accessories with Check Valves & Suction Cups: A Comprehensive Set for Optimal Airflow by Tia Campbell

The valve isn't perfect, but that's to be expected. The airflow between the valves is not equal, so you need to adjust it accordingly. My suction cups hold up well but the clips on them are so-so. They hold the standard flexible air hoses well, but anything thicker or with more resistance can cause problems. 1 out of 3 check valves worked very well. The other two limited airflow a bit. However, most check valves are a lottery and these 3 were much better overall than the 4 black packs I got from another seller. None of the items are perfect, but for the price it's still worth buying.