1.Rated working pressure:2000~15000psi 2.Nominal bore:2-1/16''~21-1/4'' Forged adaptor flange:(1) High strength(2) Anti-corrosion(3) Environmental protection(4) Heavy-duty(5) Surface roughness: Ra 6.3(6) Material: stainless steel,alloy steel(7) Surface finish: Polishing, blackening, acid-cleaning, etc