I understand that the grooves are for gas and the smooth for liquid. I have all ball lock kegs. Some are Challenger (Firestone?) and some are Cornelius. The following are just some of the posts I have.
The 3 on the right have a slimmer base. The one in the middle of the 3 is gas (has a small grove). However, they are SHORTER than the 3 that are left of them.
A shot showing the height difference. Notice the 3 on the far left are the same shorter height as the 3 on the far right, yet the 2 farthest left have a wider base. The one 3rd from the right is just star shaped (12 point) altogether.
Here you can see the difference in diameter at the base. The 2 far left are smaller in diameter than all the rest.
Could someone help label these things? From what I understand, it matters not only that the right post is in the right place (gas vs. liquid), but it also matters that the post be on the right TYPE of keg (Cornelius vs Challenger) and the same goes for poppets...???

The 3 on the right have a slimmer base. The one in the middle of the 3 is gas (has a small grove). However, they are SHORTER than the 3 that are left of them.

A shot showing the height difference. Notice the 3 on the far left are the same shorter height as the 3 on the far right, yet the 2 farthest left have a wider base. The one 3rd from the right is just star shaped (12 point) altogether.

Here you can see the difference in diameter at the base. The 2 far left are smaller in diameter than all the rest.

Could someone help label these things? From what I understand, it matters not only that the right post is in the right place (gas vs. liquid), but it also matters that the post be on the right TYPE of keg (Cornelius vs Challenger) and the same goes for poppets...???