The Parker-Hannifin 4000 Series 2.79" Poppet Manual Connect Quick Coupling is the perfect solution for your add-on hydraulic circuit applications. This coupling features a hardened locking ball groove that resists wear for increased durability, as well as a shielded valve and positive valve stop that prevents flow checking for smooth performance. This coupling is designed to handle up to 3000 psi of maximum operating pressure. FleetPride is your First Click in Heavy Duty®.