Maybe your glass downstem broke. Most water pipes come with a downstem, but if you need a replacement downstem, then you've come to the right place.
These glass-on-glass downstems are 19/14mm. White Rhino glass downstems come in a variety of sizes: 3.0", 3.5", 4.0", 4.5", 5.0", 5.5" and 6.0". They are diffused so your smoke is slightly percolated as it enters the chamber of your water pipe.