Slit Diffuser Chillum with Rainbow EffectThe beautifully shimmering chillum has diffuser slots and transforms bongs with standard cut NS 19 into NS 14s. The diffuser slots make the bong water bubble properly, which cools and filters the smoke. The diffuser guillum is made of robust borosilicate glass and has an inside cut that fits almost completely into the 19 cut and closes the cut tightly. Attention: The length is measured from the upper edge of the lower cut.