Originally Posted by MstrKey
Don't just replace the disk. It obviously burst for a reason. Usually the reason is that your regulator is creeping beyond the safe pressure limits of the burst disk. You should rebuild and clean the regulator as well as replacing the disk.
If you don't have a fill nipple cover, invest in one of those as well.
The 1.8k disk fails when your reg leaks (internally). Depending on your skill and comfort level, your paintball shop should be able to help.