AQUATEK Premium Brass Check Valve for Planted Aquariums

I had ordered this and received one that was not working. I was able to return for another one and it works perfectly. Love that now my CO2 tube doesn’t pop off anymore. Great product.

Worked as intended, I did place the the check valve after the bubble counter, because if I placed it before the reactor Im using sucks out the bubble do to negative pressure and couldn't measure the bubble rate. Reactor would suck out the gas out the line.Ps -Is you have water running back in the tube1- wrong tubing that doesn’t handle high pressure and leaks. Tubing should be thicker and stiff vs the soft thin kind like for air stones or petco tubing etc.2- recheck all connections for leaks. If the air leaks out then the pressure leaks and water runs back in.

Works great! Seems to be preventing backflow. Tested backwards just to make sure ;].The tightening nuts work a treat. They hold the tubing on very securely. I used this with the AQUATEK CO2-Proof Tubing and had no leaks or issues of any kind.If you get similar tubing, I would recommend boiling a mug of water in the microwave, and then holding the end (about the last inch or so) of the tubing in the water for about 30 seconds. The tubing becomes very flexible, and can then be put on very easily. Depending on your tubing, this may not be necessary (or recommended).

Built sturdy, but valve didn't function properly. Took excessive pressure to initially "reopen" the check valve each day. After evening CO2 solenoid shut-off, gas then would not flow through the check valve the next morning until I doubled the line pressure to 60psi, then it opened fully. I'd have to manually readjust the pressure back down to my target delivery rate every morning. Never had this issue with other check valves.

It's a brass check valve for co2. I challenge you to find one that's as available, and affordable as this one. I've not noticed any back flow for about 6 months, I guess. Since new.. So, I bought another co2 kit and this check valve--again. So, I suppose one could say I've built a modicum of trust with it.

A very durable product at a good price. It arrived on time and in excellent condition.

do not know i returned no longer needed

It does what it's supposed to do and theres no signs of leaking or water getting past it.