The SPEARS 1401 is a series of PVC tube fittings used for connecting and branching flexible polyethylene tubing commonly used in irrigation, low-pressure water lines, and pneumatic systems. Here's a breakdown of the key feature. It is mad of PVC (Polyvinyl Chloride). They are for Connecting and branching flexible polyethylene tubing. A common feature of SPEARS 1401 fittings is having barbed male inserts on the ends. These barbs grip the flexible tubing to create a secure connection without the need for clamps or glue.