Review on 🐠 Enhance Your Aquarium Air Pump System with Y-Axis 49 Pcs Accessories for Optimal Airflow and Oxygenation! by Kim Thomas

Check valves always seem to work or not, but the ones I received were particularly bad. One of them had no airflow at all with my pump. Another limited airflow around 85% and the last 2 were 50% at best with one of them making a whistling noise. I have a low powered pump, but I've had other check valves that didn't restrict as much. I won't use any of these. The suction cups don't suck well and don't hold as well as other suction cups with hard instead of soft clamps. I probably won't use either. Control valves and fittings are the only durable elements. Haven't tried air stones yet. I was going to give it a 2 star rating as the check valves and suction cups are not up to par, but the package is still a good deal if you don't need those items. So 3 stars.