Is there a reason there is a carb on a glass pipe?

[mfqr]

Its there just for good looks....nothing to do with simple air pressure.

You can plug it if you want....

Uh... it does what all the other people above you said. A carb does not make it look 'good'. They are right, because when you hold it, the smoke gets trapped, it creams up real nice. Look at your pipe, if you have one, and hold it while you are hitting it. The stem of the pipe fills up completely with smoke. When you release the carb while taking the hit, the air comes through the carb and helps push the smoke into your lungs.