Black Leaf ''3-Arm'' Percolator Bong Pre-Cooler Amber Size:SG 19mm but this is harmless

but this is harmless

then the Mexican Flowers by Black Sheep is the one

a spiral ensures more proper turbulences in the glass pipe and a splash guard protects against water splashes

or when the device is turning off

Black Leaf ''3-Arm'' Percolator Bong Pre-Cooler Amber Size:SG 19mm but this is harmlessA Black Leaf Pre Cooler with a blue 3 Arm Percolator. This Pre Cooler fits on any bong with a SG 14 or SG 19 friction fit ground joint, according to your selection. The Black Leaf logo can be found lower down. Short description Material Borosilicate Glass Colour amber Print Black Leaf Height 115mm Diameter 40mm Grind 2x14 (14. 5mm) InsideCut