LASCO Swing Joints are designed for use with open discharge systems. The Lasco Swing Joint features a unique molded swing arm and connections with diameters and clearances to allow for 360 Degree of movement and to reduce stress concentrations. LASCO Swing Joints feature an O-ring joint design, built-in stops to prevent over-torque while rated at a maximum working pressure of 315 PSI at 73 Degree F without leaking or failing. Swing Joints are designed for use with bottom or side sprinklers. All Lasco Swing Joints are pressure rated at 315 PSI. Gray color on some swing joints does not necessarily indicate Schedule 80 pressure rating.