The 14mm Inline Donut Rigs by Darby Holm for DC Glass. These diffused oil rigs feature a stemless water chamber with a fixed multi-hole inline base perc and a fixed donut splash guard with a 14mm reinforced female joint. Each rig is unique with its own set of custom DC decals and sits sturdy on a flared base. The size and function of these rigs make them ideal for dabbing but they would also make a great flower piece for daily use. These quality, diffused oil rigs are hand blown from boro glass in Southern Oregon.