A bottom line normally implies that you have an ASA mounted to your grip (or drop) that you screw your tank into. A hose (steel braided or macroline) connect the ASA to your guns' input (either directly to the gun itself or through a regulator or gas-through grip). You'll need the appropriate connectors to attach the "hose" to the ASA and gun sides. Here's a picture of a bottom line setup on a T-Ranger T-Ranger pic Hope this helps.