Without a doubt, using a diffused downstem makes your hits so much smoother than hitting from an open-ended downstem. This 4-inch Diffused Downstem with a 19mm male ground joint and a 14mm female slide joint features 40 holes, for great filtration and cooling.

Note: The length of this downstem from the bottom of the ground joint to the diffused bottom is 4-inches. The length from the top of the ground joint to the diffused bottom is 5-inches. The complete downstem length is 5.35". 

Made of high-quality borosilicate glass, this downstem is durable and made to last.  Whether you're looking to replace a broken or lost downstem or want to upgrade your bong to a diffused downstem, this is a top-quality piece to get.