You put water in them, as with bongs and smoke, to make the vapor cooler and smoother. You're supposed to add something else called a "nail" to hold the concentrate, and a "torch" to vaporize it ...

Impacted local residents hoping to replace that lost vape battery, pipe ... "Dab rigs and gravity bongs are very expensive products, but pipes can start at five to $10. And there's [also the ...