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Quick Connecting Coupling (HS-QC-002). Ball Locking Mechanism: Ensures reliable connection every time with a durable ball-locking mechanism. Double O-Ring Seal: Provides redundancy for low pressure and vacuum applications to minimize seal damage. Precision Machined Parts: Coupling and nipple are precision machined from solid bar stock for high quality. Versatile Applications: Suitable for oil, petroleum, chemical, water, gas, and hydraulic machinery. OEM/ODM Service: We offer best CNC Machining OEM and ODM service for custom requirements.