The 4inch Downstem by Medicali are the perfect reserves. They allow you to match your downstem to any water pipe or piece. The removable downstem has slits at the bottom for added percolation which offers filtration and purification. It will be the first line of filtration in your smoking session. The bubbles that the downstem creates lets you know that it is working. Add a little extra cleansing to your smoke, for an amazing clean toke every time. Add to your water pipe for extra filtration or to replace one that has become mucky. Get ahead of the game by being proactive and having replacements in your arsenal so that you can smoke with confidence. Breazy Green is happy to welcome Medicali, an equally sustainable company. They provide American made, strong and durable glass, that is built to last.