difference between gas and liquid poppits on ball lock kegs

I read somewhere on HBT that the gas and liquid poppits on corny kegs are different somehow and that you shouldn't get them mixed up. I'm wondering how do you tell them apart, and what happens if you get them reversed?

 

Poppets are the same per type of keg usually. Are you talking about posts or poppets. Midwest has a pretty good supply of poppets and post types. That should help you. http://www.midwestsupplies.com/searchspring/result/?cat=&q=Poppets

 

maybe I do mean posts. I just remember reading "when you put the keg back together, don't mix up the gas and liquid sides" or something to that effect. I'm just trying to figure out if there is indeed a difference, or if the posts/poppits are interchangeable.

 

This might help. You don't want to get them mixed up because if you do it's hard to get the disconnect off

 

Yup, 241 has a nice picture above. The gas posts have a notch/slit in them.

 

thanks for the response everyone. that totally clears it up. I was concerned I had already got mine mixed up and had no way to tell.