: The venturi can be supplied in any material including plastics. The materials generally used are SA105, SA182F316L, SA182F304L, Inconel, Duplex SS, Monel etc. Venturi upstream pressure tap is located at the mid of inlet cylinder & the downstream pressure tap is located at midpoint of the throat. When averaging is required, the pressure tapping can be taken through piezometric ring or also called as annular ring. This can be manufactured from forging or can even be fabricated from rolling the pipes, as per requirement.