Fluid fitting comprising duplex stainless steel

A fluid system comprising:

• a fluid element;
• and
• a fluid fitting for mechanical attachment to a fluid element, the fluid fitting comprising:
• a coupling body having an inner surface defining a bore for receiving the fluid element therein, and a seal portion formed on the inner surface for engaging the fluid element, and
• a ring configured to fit over at least one end of the coupling body for mechanically attaching the coupling body to the fluid element,
• wherein when the ring is installed on the at least one end of the coupling body via force with the fluid element received in the bore, the ring applies a compressive force to the coupling body sufficient to cause permanent deformation of the coupling body such that a tooth of the seal portion bites into the fluid element to thereby attach the fluid element to the coupling body in a non-leaking manner, and
• wherein at least one of the fluid element, the coupling body, and the ring comprises duplex stainless steel.