Standard barb fittings for flexible tubing are the most basic water cooling fittings. Designed to fit into flexible tubing of a specific inside diameter, the barb portion will have one or more ridges that slide into the tubing and keep the liquid from escaping. Outside diameter is only important for sizing the clamps that should be used with these fittings. Standard barb fittings are typically one of the most economical choices for flexible tubing, with the cost of clamps offsetting the savings somewhat. TITAN RIG carries standard barb fittings in a wide range of colors and sizes from all of the major brands in the industry and at prices you can afford.