Details: The handmade 'BL' Pre-Cooler from 'Black Leaf' lengthens the smoke path for cooling and provides air vortexes with its 5-arm percolator. It also reliably filters out dirt and ash particles. The precooler is made of high-quality borosilicate glass and is supplied together with an adapter. That makes it suitable for all bongs with SG 14 and SG 19 standard grinding.