1/2" Npt Flat Face Hydraulic Quick Connect Couplers/Couplings Set, Decohongdi Flat Face High Flow Skid Steer Hydraulic Quick Connect Coupler -New valve design with resistance to damage from high flow and pressure of impulse,ensuring durability and longevity of the coupling. Hydraulic Coupling Quick Disconnect Couplers Set -Sleeve locking mechanism engaged by rotating sleeve after connection,providing a secure and reliable connection every time. Quick Disconnect Coupler w/Dust Caps-Advanced anti-rust performance due to the new chrome plating treatment,ensuring the coupling stays in optimal condition even in harsh environments. Flat Face Hydraulic Quick Connect Coupling-Durable ball-locking mechanism for added strength and stability during operation,minimizing the risk of accidental disconnection. Hydraulic Coupling-Sleeve mechanism designed to prevent dirt from entering the internal mechanism,maintaining the efficiency and reliability of the coupling.