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Checking for Co2 Leaks


Use good leak detection liquid. There are many on the market, but good old ‘Mr. Bubble’ works great. It’s made for bubbles.


1)      One of the most common areas for Co2 leaks is the easiest to find. The Co2 connecting nut from the regulator to the Co2 tank. There should always be a washer or gasket seal attached to the stem or inserted in the nut. This gasket should be replaced every two changes.

2)      Located on the side of the regulator bonnet (the cone with the adjusting screw) is a small hole. This is the ‘Weep Hole’ If the diaphragm or seat cartridge inside of the regulator is damaged you will have Co2 leaking from the hole. It may leak constantly or only when the regulator opens.



Text Box: # 1) washer or gasket seal


Text Box: # 2) Weep Hole

If you are having trouble keeping the pressure regulated, this is also a symptom of the diaphragm or seat/cartridge being worn or damaged.

A)          To test for this problem first, turn off the Co2 at the tank. Loosen the set screw on the regulator bonnet (counter clock wise) until it is loose.

B)                       Remove the regulator bonnet. Their may be 4 screws (Cornelius) or the bonnet may have a hex molded into it. (Norgen, Tap Rite, Chudnow). As you remove the bonnet counter clockwise, remove it slowly so the diaphragm and spring assembly do not fall out.

C)                      With the bonnet and diaphragm removed you should see into the regulator body. In the center of the body is the seat/cartridge that allows the Co2 to be released.

D)                      This next step you will need to be careful with. Your Co2 bottle should ALWAYS be secure. With that safety note said. Next, slowly open your Co2 tank valve. You should NOT have Co2 being released from the seat/cartridge. If Co2 is leaking out then the seat/cartridge will need to be replaced.

E)                       Inspect the diaphragm for worn cracks. Many times if the seat/cartridge is damaged the diaphragm will be damaged also. And the Co2 will leak out of the ‘Weep hole’ on the side of the bonnet.


3)      Check all connection with your “Mr. Bubble’ making sure that all clamps are tight.

4)      Check around the seals and o-rings were the Co2 line connects to your beer keg.

5)      It you have not inspected your Seals and O-rings in the keg fitting. You may find that leaking only accurse when you attach the beer keg fitting to the keg. The ‘Sankey’ Fitting has 3 o-ring inside that allow the beer to flow out and the Co2 in. One bad o-ring can cause over foaming or lose of Co2.


      For replacement parts see:


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