... bauer coupling is made of carbon steel with hot zinc plated. size:from 2" to 8" parts:female, male, lever ring, rubber gasket ... or S/Sparts: male tail, female tail, lever ring and rubber gasket size: 2", 3", 3-1/2",4",6", ... , strainer, pipe galvanized and non-galvanized similar couping:perrot coupling, ferrari coupling application:irrigation, mining and tunneling, civil engineering project,emergency ...