Try it without a checkvalve and see if you get better pressure.
If you put your airpump above the tank, it won't usually drain water out as the water won't travel upwards. To be honest, I've never used a check valve. lol.
I mentioned it in my original post that without the check valve it has great pressure
So hubby and I actually couldn't even blow air through the check valves on it. Found a different kind that is doing much better. However, I think I'll just have him put a little shelf on my wall above the tanks and run them without check valves. That's going to probably be my smartest bet.
Thanks for the others posts as well, I just wasn't sure if they were all the same but finding that other one tells me that no, and the ones I have on there were crap.