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Protect your bongs (especially silicone) from high nail temperatures and prevent the destruction of your glass downstems due to the steep temperature gradient between nail and water reservoir. There are plenty of possible combinations of lengths and diffusion and the materials will last your lifetime. It doesn't get better than this. It's the last downstem you will ever need to buy.
Great diffusion, awesome color, easy to clean, intuitive and highly adjustable design. Adjusts to fit any size bong combined with both 14 and 18mm piece make for the best down stem anyone could ask for!