3/4" x 3/4" Female NPT In Line Compressed Air Compressor Check Valve Brass

3/4" NPT In-Line Air Compressor Check Valve with 1/8" Side Port

Replacement 3/4" NPT in-line check valve. Designed to stop air from flowing back into the pump once the unit shuts off, this universal valve is a must-have for protecting your compressor system and maintaining consistent performance.

This inline valve features 3/4" female NPT threads on both ends, making it compatible with a wide range of air compressors and pneumatic setups. It also includes a 1/8" NPT side port, commonly used for connecting an unloader valve to relieve pump pressure after shutoff. If your setup doesn’t require an unloader, the port can be securely plugged.

Crafted for durability and easy installation, this valve is clearly marked with an arrow on the inlet side to eliminate guesswork. Its compact 3-1/4" length makes it ideal for tight installations where space is limited.

Specifications:

• Inlet Thread Size: 3/4" Female NPT (3/4" NPT measures approx. 1" in diameter)

• Outlet Thread Size: 3/4" Female NPT (3/4" NPT measures approx. 1" in diameter)

• Side Port Thread: 1/8" Female NPT (1/8" NPT measures approx. 3/8" in diameter)

• Overall Length: 3.25" inches

• Thread Type: National Pipe Thread (NPT)

• Design: Inline configuration with side unloader port

• Function: Prevents air backflow from tank to pump after shutoff

• Installation Guide: This valve is directional flow. There is an arrow stamped on the side to show flow orientation.

• Unloader Valve Compatibility: Side port allows optional unloader connection or can be plugged if unused.

• Application: Suitable for most air compressor systems using 3/4" NPT lines

Whether you're building a new system or replacing a worn check valve, this part offers a reliable, efficient solution to maintain safe operation and extend the life of your compressor.