1-1/4" Female NPT x 1-1/4" Male NPT Brass Air Compressor In Tank Check Valve

Upgrade your air compressor system with this high-quality 1-1/4" Female NPT x 1-1/4" Male NPT in-tank brass check valve. Designed to prevent backflow from the tank to the compressor pump, this valve helps protect your equipment by ensuring pressure stays isolated when the compressor is off. Constructed from durable, corrosion-resistant brass, it’s built to withstand daily use in tough environments. The valve includes a 1/8" Female NPT side port, typically used for an unloader valve on your pressure switch or compressor. If not needed in your setup, this port can be securely plugged. Whether you’re replacing a worn check valve or building a new compressor system, this part ensures reliable, leak-free performance. Specifications: Valve Inlet Threads: 1-1/4" Female NPT (measures approx. 1-9/16" in diameter) Outlet / Tank Threads: 1-1/4" Male NPT (measures approx. 1-9/16" in diameter) Side Port: 1/8" Female NPT (measures approx. 3/8" in diameter) for unloader line Total Length: 4-1/4" Material: Solid Brass – corrosion resistant and long-lasting Prevents backflow and tank pressure from reaching the pump after shutdown Designed for direct installation into compressor air tanks Compatible with pressure switches that use unloader lines Side port can be plugged if unloader is not required Made in the U.S.A Ideal for industrial, automotive, and shop compressor systems

• Valve Inlet Threads: 1-1/4" Female (measure about 1-9/16" in diameter)
• Outlet Threads/Tank Threads: 3/4" Male NPT (measure about 1-1/4" in diameter)
• Side Port: 1/8" Female NPT (measure about 10/32" in diameter)
• Total Length: 4-1/4"
• Material: Brass