1) Material: carbon steel, stainless steel and alloy steel 2) Standards: ANSI, ASME, JIS,DIN, UNI, BS 3) Flange style: PL, SO, WN, SW, THR, LJ, and BL 4) Style of sealing face: FF, RF, RTJ/RJ, male and female, tongue and groove 5) Nominal diameter: 1/2"-5,000mm 6) Surface treatment: transparent oil, rust-proof oil, hot galvanizing 7) Price: very competitive 8) Special design available