This product has been superseded.  We now only sell the pack of 10 of these.  Part number KL07122.  Click on link below to purchase:

https://www.kegland.com.au/10-x-post-o-rings-value-bulk-pack.html

Replacement O-Ring for ball lock or pin lock keg posts

Please note the post does not come with it. Or the 50cent coin.