Air compressor check valve (brass) with three external threaded connections Key benefits Restores proper compressor operation by preventing air backflow into the pump and lines. Protects the piston pump and reduces premature cycling or pressure loss. Durable brass construction delivers reliable pressure resistance and long service life. Easy to install with threaded ends, making replacement quick and straightforward. What it does One-way check valve that allows compressed air to flow from the compressor to the tank and system while blocking reverse flow. Designed as a direct replacement for an old or defective check valve on air compressors that use external threaded ports. Main features Material: high-quality brass for corrosion resistance, strength, and consistent performance under pressure. Connections: three external threaded ports intended for pipe connections, the air pressure tank, and the compressor piston pump. Installation: screw-in threaded ends for fast, tool-friendly installation; use appropriate thread sealant or tape as recommended for your system. Compatible uses and applications Home garage compressors: replace a worn check valve to restore tank pressure and protect the pump during operation. Small workshop and light industrial pneumatic systems: maintain system reliability by preventing backflow into pumps and lines. Portable compressor units or onsite service equipment: quick field replacement to minimize downtime and keep tools operating at expected pressure. Why choose this part Specifically built as a direct replacement for compressor check valves with three external threaded connections. Brass construction offers the pressure resistance and durability required for compressor duty. Straightforward installation reduces repair time and gets your compressor back to working condition quickly. Notes Confirm your compressor’s connection layout and thread type before purchase to ensure compatibility. Use standard installation practices and thread sealant where appropriate.