Form This specification covers a copper alloy (brass) in the form of seamless tubing with nominal OD of 0.405 inch (10.29 mm) to 10.75 inches (273.05 mm) and nominal weight of 0.253 lb/ft (0.38 kg/m) to 2.176 lb/ft (3.24 kg/m) (see 8.6). Application This tubing has been used typically for parts requiring resistance to corrosion by salt@ fresh water@ salt air@ or gases@ but usage is not limited to such applications. Classification Tubing is classified by nominal working pressures as follows: Type I - Nominal working pressure 100 psi (689 kPa) Type II - Nominal working pressure 200 psi (1379 kPa) Type III - Nominal working pressure 300 psi (2068 kPa) Type IV - Nominal working pressure 450 psi (3103 kPa)