So I got my co2 tank this morning and I have just started testing my regulator, first attempt I open up and co2 level in my HP started dropping at a fast rate. I ran to Lowes and got a plug for my outlet and tried again, same thing. I found out it was a fast leak from the regulator itself. Almost giving up I found a plug in the back and tightened it, the pressure dropped even faster so I loosened it and slowly the flow of co2 that was escaping started to slow down till it stopped completely. I guess that was a pressure release valve. Now it's holding and I'll know if it passes by 10 minutes to 7 tonight.