The oil bowl made of robust quartz glass with clear standard grinding can be attached to a heating coil with 20mm inner diameter so that the nail can be comfortably evenly heated. The risk of accidentally heating the bong's standard grinding is lower. Naturally, you can alternatively heat the bowl with a torch.
It's as easy as that: Put the bowl and the attached coil on the bong, heat the oil pan, then put some oil or wax into the pan with the respective tool and take a draw while smoke develops!
The bowl is made of quartz glass which is in comparison with borosilicate glass durably heat-resistant - the heat is kept better and longer. Signs of wear which show with borosilicate glass when heated very hot and used very often are not to be expected as quartz glass shows little thermal expansion and high thermal shock resistance.
The oil bowl/nail must be heated at the pan only, otherwise the standard grinding of the bong can break in cause of the expansion of the material.
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