Dahszhi 4-Way Aquarium Air Flow Control Lever Valve: Premium Copper Distributor for Optimum Fish Tank Splitting and Pump Efficiency Review

0.4" connector fits the 3/8" hose that came with my air pump. It was a plus. All connections and control valves work as expected.

3 out of 4 were damaged and bent. Pretty hard to miss. Don't want to wait any longer to deal with returns, I'll straighten them out, it's just awkward to deal with.

I really like them. 5/8" clear plastic hose fits snugly. No need for a hose clamp. Dams are a little tight, some difficult to adjust but doable.

Each port works as it should. Yes, it has a larger air intake opening, but it's designed for larger air pumps, not a standard air pump. Completely shut down, no air escaping. That's great!

Excellent collector for hydroponics. I use it to air my 4 way top feed DWC buckets. Each bucket requires 2 air lines - 1 for a diffuser to aerate my nutrient solution; 1 to drive the drip ring. With 8 outlets, each with its own valve so you can fine tune all of their respective outlet pressures, very handy.

I use this 2-way valve to supply medical oxygen to a CPAP machine as well as a 50ft hose. I understand that the valve is not designed for this purpose, but it serves the purpose and works perfectly. I have to adjust airflow when switching between CPAP and hose, but that's a small price to pay when everything works exactly as you'd expect.

I don't know what the thing is for, but the diameter of the "aerator end" is too big for a normal aquarium tube. Outlet ends with control valves are suitable for normal hoses. Since I was in a dilemma and needed to use it immediately, I was able to get a length of tubing to fit onto the end of the aerator by expanding the tubing with a tapered dowel as it was heated, but that's not necessary.

It enabled my wife to control two different devices with her oxygen concentrator. .her CPAP sleep at night and her attachments during the day. The problem was that when switching from one device to another, the hoses had to be disconnected, which was a problem for them. The design of this valve solves the problem, it just flips the switch. I wish the valve matched the O2 hoses better, but the zip ties hold everything in place.