high quality&resonable price Material:304, 316 ,316L , Hastelloy c,HastelloyB ,17-7PH 20#alloy nonstandar spring mechanical seal Applicable working ... advantages1,Imported material is widely used in manufacturing mechanical seals2,Direct factory price3,Professional technical services4,Products ... with much patents5,20 years experience of mechanical seal6,ISO90017,We accept O/A and all ...