Feature Highlights: 1. Durable Copper Construction – Made from solid copper, this check valve is built to last and effectively prevents gas backflow, keeping your air compressor system running smoothly and reliably. 2. Maintenance-Free Piston Design – The oil-free piston means no regular upkeep is needed. Perfect for uses where clean air matters, like in medical or food handling settings. 3. Direct Drive Efficiency – With a direct drive mechanism, energy loss is minimized so your compressor works faster and more efficiently—great for quick inflation jobs at home, in auto shops, or small workshops. 4. Compact & Portable – Small and lightweight, this valve is easy to carry and store, making it ideal for mobile jobs or tight workspaces. 5. Quiet Operation – Advanced noise-reduction tech keeps things running quietly, so it’s suitable for noise-sensitive places like offices or homes. Product Details: This sturdy copper check valve is designed for piston-type direct-drive compressors and oil-free pumps, delivering reliable performance and long-lasting use. Its non-return function stops backflow to maintain steady air pressure and system efficiency. The threaded design makes installation simple and ensures a secure fit in various pneumatic setups. Specifications: - Color: Golden - Material: Copper - Size: 4.00 × 3.80 × 3.50 cm / 1.57 × 1.49 × 1.38 in - Package Includes: 2 compressor check valves