Whether you need to replace a broken downstem or want to upgrade to one that diffuses the water, this high-quality downstem by Pulsar is a great choice. This is a glass-on-glass diffused downstem measuring 4-inches long that's outfitted with 6 slits to provide optimal water diffusion. The glass on glass diffused downstem features a 14.5 mm ground joint and a 14.5 mm slide joint. It's constructed of borosilicate glass that's known for its extreme durability. When you attach this diffused downstem to your water pipe, you'll enjoy insanely smooth hits of your favorite flower. Don't skimp when it comes to accessorizing your water pipe. Get this top-notch diffused downstem so all your smoking sessions are filled with smoothness!