Ball Lock Keg O-Rings vs Pin Lock Keg O-Rings – are they the same?

pin lock oringsPin Lock Post O-Ring on Left, Ball Lock Post O-Ring on Right

Ball Lock vs Pin Lock O-Rings

When it comes to ball lock and pin lock o-rings, some are the same.  Standard pin locks and ball locks use identical dip tube o-rings and lid o-rings

Post o-rings are a different storyStandard pin lock keg post o-rings are slightly larger than ball lock keg post o-rings

It may be difficult to see in these photos, but the left side shows a pin lock post with a ball lock o-ring installed.  The right side shows a pin lock post with the pin lock o-ring installed .  The pin lock o-ring extends out just a little bit further than the ball lock o-ring.  The ball lock o-ring is nearly flush the the lip on the post.  That small amount is the difference between the two o-rings.

Problems with Sourcing Pin Lock Post O-Rings

Most resellers stock one model of post o-ring… ball lock post o-rings.  They sell the same size for both kegs.  Even though they’re a different size, ball lock post o-rings will stretch enough to fit on a pin lock post.  They do fit, but are finicky.  Worst case, you’re going to lose a tank of CO2.  That’s going to cause you to have to lug your tank to your CO2 provider, which is a waste of time and money, not to mention frustrating.

All that to say, it’s tough to even find pin lock post o-rings at all, let alone find them in bulk and in food safe materials.

Valuebrew stocks Pin Lock Post O-Rings in food grade silicone in bulk quantities.

Why You Should Stock Up

I recommend stocking up on spare o-rings.  This is especially true for post o-rings.  In my opinion you should be changing those liberally.  My recommendation is every other batch.  This is a part that costs a few cents.  It’s also a spot that is tough to check for leaks and a faulty o-ring, which happens regularly in my experience, can cause problems like carbonation issues and loss of CO2.  Before figuring out this problem I lost two tanks of CO2, back to back.  That’s lost time, frustration and a waste of money.  I suggest keeping a stock of spare keg, QD and Universal Poppet o-rings.

Two Related Resources

Ball Lock vs Pin Lock + Parts Reference:

Also: Kegerator Tips & Gear | Keg Repair Part #s | Recent Keg Finds

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Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions. toppost:pinkegorings tag:tpr rs:1


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