... galvanized, all be antirust treatment. 6. Pipe Fitting Usage: Suitable for joining pipe lines of water, gas, oil, air. ... Circular, Square, Hexagon Shape: Reducing with/without ribs Connection: Female Type: Coupling Technics: Casting, malleable Pipe Fitting Surface finishing: Black ... Threads: ISO 7/1 ITEMMATERIAL GALVANIZED THREADS AVAILEBLE SIZE Pipe fitting ASTM A-197, EN1562, ISO5922 ASTM A153, ...