Flow filter flanges are available in different sizes.
The flanges are provided with screw holes and can also be used to screw somewhere against the flange.
The hose connection is conical for easier mounting.
The flanges are available in four different diameters.
Each flange may run into one or several sizes.
Explanation flange typing:
First number indicates the diameter of the filter to where the flange can be mounted.
Second number is the diameter of the connection of flange where the hose is mounted on.