Upgrade airflow with this multi hole diffused downstem that converts an 18mm bong joint to a 14mm bowl joint while sending smoke through multiple slits for extra filtration. Select 2.5 inch or 3.5 inch lengths so the tip rests in water without bumping the base, producing steady bubbles and a smoother pull. Built from thick borosilicate glass, it swaps in and out easily for quick cleaning and fits most beaker or straight-tube pipes.

• 18 mm outer joint, 14 mm inner joint, universal sizing for common bowls

• Multiple diffuser holes break smoke into fine bubbles, cooling each hit

• Two length options, 2.5 in and 3.5 in, match water depth for optimal diffusion

• Borosilicate glass resists thermal shock, cleans with isopropyl alcohol

• Slip-fit design installs in seconds, perfect for beakers and straight tubes