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We love diffused downstems: they’re easy to clean or replace, they filter smoke like a dream, and you can choose different types of diffusion based on what your needs are. Unfortunately, these tiny yet crucial pieces of glass do tend to break, which is why we carry a full line of diffused downstems for that unfortunate moment. Stock up on a couple to make sure you’re ready no matter what. This 18mm downstem is perfect for a water pipe of any size with an 18mm joint and will hold male accessories. Available in 2.5”, 3”, 3.5”, 4” and 4.5”, measure your bong with the good old pencil trick to see what the right size is for you: stick a pencil in through the downstem slot in the bong and see how far the pencil goes. Let it rest a tiny bit above the bong’s base, mark the spot on the pencil, see how many inches it went down and voila! Now you know which size downstem is best for your water pipe.