Before revision: More Information can be found on ANAYA URL and Plastic Pipe Shop Tank Connectors are widely made of Plastic (PVC) or Brass, in many continents this connectors are also known as tank nipple as it has male threads, Tank connectors have a flange either on the edge of one side or in center to be jammed with tank wall, This connectors are also supplemented with rubber washer and sometime plastic washer with hexagonal flange nut, to tighten the connector with the tank wall.
After revision: Tank Connectors are widely made of Plastic (PVC) or Brass, in many continents this connectors are also known as tank nipple as it has male threads, Tank connectors have a flange either on the edge of one side or in center to be jammed with tank wall, This connectors are also supplemented with rubber washer and sometime plastic washer with hexagonal flange nut, to tighten the connector with the tank wall.