Usage Tips:UNIVERSAL STANDARD SIZE & NO LEAKS: For Cornelius , standard size (19/32-18) posts for replacement of worn out posts that no longer seal properly. Ball lock posts with o-rings to prevent leak. HEALTHY MATERIAL & DUARABLE CONSTRUCTION: Made of stainless steel for long last durability, better material for . Detachable design for easy daily cleaning. Perfect replacement parts for used kegs. WHOLE SET POST WITH REPLACEMENT O-RINGS: 1 x gas post, 1 x liquid post in the package, replace old posts with the one immediately after opening the package.Comes with replacement O-rings. HOW TO IDENTIFY THE GAS POST/ LIQUID POST: There is a circle of small at the bottom of the gas post, and no marks on the liquid ball lock posts. Please make sure you have the right post for replacement. Material:stainless steel colour:Silver Package Contents: 1 * liquid post 1 * gas post with poppet 2 * more o-rings for poppet 2 * more o-rings for post Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.