Yesterday I was going to fill the acecare carbon bottle and I had to assemble the valve without any instructions. The valve I have circled indeed looks like other pics I've seen but not like mt scba tank vale regulator. It almost seems like it's too restricted and won't allow the compressor to fill it any faster than slow. I even tried filling it with another scba tank and it just seemed to sit there without taking much air. When I decided to take the valve out, what air was in there took 25 minutes to escape even though there wasn't any air reading on the tank valve pressure gauge or on the filling bottle gauge. Like it took barely any air at all. Does anyone know if this valve is specific for SCUBA or something and restricted more than normal? My scba vale lets air out and fills much faster with it's valve being much larger.