These fittings are not just Heavy-Duty!
They are Made in the USA solid brass and solid steel.
Series: 3 Part Numbers: 3003, 10-3, 11-3 Interchange: M Style, Industrial, I/M, MIL Body: 1/4" Body Plug Thread: 1/4" NPT
Material: Heavy-Duty Brass and Steel Quantity: 40pc
Working Pressure: 300psi