This series of couplers are the most common quick connect couplers used in the agriculture, construction and logging industries. They are interchangeable with all ISO 5675 series including ball seat valve, poppet seal, push-pull couplings. ISO Body Size : 1/2 Port. Thread : 1/2 NPT. Features: 3600 PSI Rating. 23 GPM Max Flow. Hardened Steel Plugs. Special Push/Pull locking sleeve design. 23,000 PSI Burst Rating (Coupled).