Manifold Coupling 1 in.. The Spears Manifold Coupling 1 in. Swivel x Swivel offers a tight connection between irrigation systems and pipes. Made from high-grade material, this manifold is fit for long-term use. It works effectively at a maximum pressure of 150 PSI, thus ensuring reliable use without getting damaged. Thanks to its male thread pipe and O-ring seal, this manifold coupling offers a leakage-free connection. Its swivel coupling feature allows individual rotation of an attachment.