Complete Installation set: Includes 2 female and 2 male couplers 4 washers for simple setups, boosting maintenance efficiency and minimizing equipment downtime Upgraded Built in Plunger: The unique plunger structure prevents contaminants from entering the hydraulic systems, while spirals seals ensures leakproof reliability and reduced maintenance needs Precisions Thread Design: Features precises thread conversion, ensuring secure connection in hydraulic systems by resolving thread mismatch issues efficiently Durability Stainless Steel: Make from stainless steel, these hydraulic hose fittings withstand high pressure applications with excellent pressure resistance and impacts durability Universals Compatibility: This hydraulic quick coupler and most China made small excavators, solving connection issues with its adapter capability for seamlessly hydraulic systems integration, Manufacturer: FROMCEO