Bulk Keg Orings and Keg Repair Part Numbers


You can save a bunch by buying keg o-rings in bulk.  Here are some part numbers, background and tips on keg gaskets along with some part numbers and sources for additional keg repair parts.

Silicone vs Buna-N
Silicone is softer than Buna-N.  Silicone also remains softer at cool temperatures.  Because of this, silicone is supposed to provide a better seal.

I use use Buna-N on my liquid posts because they are cheaper and I figure a leak is going to be very evident – Beer is… visible.  I use silicone on my gas posts because they seal better.  You cannot see leaking CO2, so I want these to seal as well as possible.  This also color codes posts for easy identification.  Black o-rings are liquid and orange o-rings are gas.

A Note on Gas O-rings I am quick to replace gas o-rings.  This leak is difficult to test for.  I lost an entire CO2 tank because of a bad gas o-ring.  In bulk, these are cheap, replace them liberally.

Dip Tube O-rings
Buna-N: 109 Buna-N O-Ring, 70A Durometer, Black, 5/16″ ID, 1/2″ OD, 3/32″ Width (Pack of 100)

Silicone: 109 Silicone O-Ring, 70A Durometer, Red, 5/16″ ID, 1/2″ OD, 3/32″ Width (Pack of 100)

Post O-Rings
Buna-N: 111 Buna-N O-Ring, 70A Durometer, Black, 7/16″ ID, 5/8″ OD, 3/32″ Width (Pack of 100)

Silicone: 111 Silicone O-Ring, 70A Durometer, Red, 7/16″ ID, 5/8″ OD, 3/32″ Width (Pack of 100) – use silicone for pin lock kegs

Lid O-Ring
Buna-N: 417 Buna-N O-Ring, 70A Durometer, Round, Black, 3-1/2″ ID, 4″ OD, 1/4″ Width (Pack of 10)

Leaky Lid-Orings
William’s Brewing Oversize Keg Lid O-ring is slightly oversized and made from a softer rubber.  It’s designed to help you achieve an airtight seal for leaky ball and pin lock keg lids.

Internal Ball Lock Quick Disconnect O-Rings
Silicone: 013 Silicone O-Ring, 70A Durometer, Red, 7/16″ ID, 9/16″ OD, 1/16″ Width (Pack of 100)

Theses o-rings aren’t exactly the same as the standard square sided o-ring that comes in quick disconnects, but they do work well for me and this is certainly more economical than buying a whole new quick disconnect.  Here is an exact replacement for CM Becker Ball Lock Quick Disconnects.

Pin and Ball Lock
I only use ball lock kegs, but it’s my understanding that pin locks and ball locks use the same o-rings.  On the post o-rings, the silicone seems to be the best choice.  The flexibility of silicone makes them work better than the Buna-N version on pin lock kegs.

Universal Poppet O-Rings
Size Dash 008 fit all styles of Universal Poppet that I have tested.  Since universal poppets can vary slightly between manufacturers, I cannot guarantee they will work with your poppet.

Buna-N: 008 Buna-N O-Ring, 70A Durometer, Black, 3/16″ ID, 5/16″ OD, 1/16″ Width (Pack of 100)

Silicone: 008 Silicone O-Ring, 70A Durometer, Red, 3/16″ ID, 5/16″ OD, 1/16″ Width (Pack of 100)

A note about food safety Most of the o-ring part numbers that are linked to in this post are not specifically marketed for food use or as food safe.  That’s true of many of the o-ring offerings I see across a range of sources.  I have an offering pulled up as I write this that offers 5 o-rings (1 lid, 2 post and 2 dip tube) for ball lock kegs.  They appear to be Buna-N but the description says nothing about what material they are made of or if they meet food safety certifications.  You may feel better about purchasing a gasket from a homebrew shop and feel like it’s “food safe” because it’s being marketed as a for use in a keg, when, in fact, it may be identical to the parts listed here.  Also, How much contact do these have with your beer?  For lid o-ring – yes.  I think that is exposed on the inside of the tank.  So, if you splash beer up on that, there will be contact.  The internal ball lock o-ring probably makes contact as well.  As for me… I have every o-ring listed above and I use them on my kegs and ball lock QDs.  All of this to say… if you’re concerned about using gaskets that are specifically marked as food safe you should keep looking.

Other Keg and Kegerator Rebuild & Replacement Parts

Stainless Steel Ball Lock Quick Disconnects

Keg Quick Disconnects on Amazon

McMaster Carr is also a good source for bulk o-rings.  McMaster does charge an additional shipping fee.  Their website does not show that.  It’s added on after you place your order.  To get exact shipping charges you need to call or email McMaster for a quote.

McMaster Carr Part Numbers
  • Dip Tube O-rings Buna-N – 9452K172
  • Dip Tube O-rings Quad Sealing Buna-N – 90025K368
  • Post O-rings Buna-N- 9452K23
  • Post O-rings Silicone – 9396K24
  • Lid O-rings Buna-N – 9452K218
  • Lid O-rings Silicone – 9396K926
  • Internal Quick Disconnect O-rings Silicone – 9396K18


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6 thoughts on “Bulk Keg Orings and Keg Repair Part Numbers

  1. Jonathan

    Silicone: 417 O-Ring, Silicone, 70A Durometer, 3-1/2″ ID, 4″ OD, 1/4″ Width, Red (Pack of 5)

    has been unavailable on amazon for like 1-2 years from what i’ve seen. might be worth removing or updating link.

  2. _Dan_

    This is the O-Ring for most replacement keg PRVs.

    007 Silicone O-Ring, 70A Durometer, Red, 5/32″ ID, 9/32″ OD, 1/16″ Width

  3. rockethacker

    best thing i ever did was buy two colors of post o-rings from McMaster. Black for beer. Green for gas. Now i never get them mixed up when making connections inside of my dimly-lit kegerator.


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