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The "Circ" pre-cooler from Heisenberg (HNBG) provides the finest smoke attenuation for all 18.8mm cut glass bongs thanks to the percolator integrated at the bottom of the cooler. Optimum performance and ideal swirling are achieved with this cooler when the water is approx. 1cm above the perc. The size of the Heisenberg pre-cooler is 15cm.
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