The Female Flush-Face Coupler from Buyers Products is easy to connect with a simple push. There's no need to retract the sleeve. Manufactured to ISO 16028 specs, the coupler has a 5000 PSI rating and a 4 to 1 safety factor. It has several key safety and operational features that protect your system. Its locking sleeve prevents accidental disconnection while in operation. The coupler also is designed to prevent air inclusion upon connection and spillage upon disconnection. A push-on rubber dust protector for the coupler side helps keep contaminants from entering the hydraulic system