An ultrasonic flow meter device , comprising: a piping arrangement comprising a tubular body extending along a longitudinal axis (L) from a first end to a second end and including a measurement section disposed intermediate the first end and the second end , the tubular body defining a fluid passage extending along the longitudinal axis (L) through the tubular body from the first end to the second end ; at least two ultrasonic transducers disposed on opposing sides of the tubular body and spaced apart along the longitudinal axis (L); and at least two reflective elements disposed on the opposing sides of the tubular body and spaced apart along the longitudinal axis (L), wherein the piping arrangement comprises: an outer pipe body ; and an inner sleeve made from a polymeric material, the inner sleeve being disposed within the outer pipe body , and wherein the inner sleeve defines the measurement section and the fluid passage of the piping arrangement , characterized in that the outer pipe body is made from a metallic material, and wherein the inner sleeve is over molded within said outer pipe body , and each of the at least two reflective elements is disposed on a respective bracket inserted in the fluid passage , and, preferably, each bracket is removably inserted in a slot defined in an interior surface of the inner sleeve and extending along the longitudinal axis (L) from a respective one of the first end and the second end of the tubular body to the measurement section . a piping arrangement comprising a tubular body extending along a longitudinal axis (L) from a first end to a second end and including a measurement section disposed intermediate the first end and the second end , the tubular body defining a fluid passage extending along the longitudinal axis (L) through the tubular body from the first end to the second end ; at least two ultrasonic transducers disposed on opposing sides of the tubular body and spaced apart along the longitudinal axis (L); and at least two reflective elements disposed on the opposing sides of the tubular body and spaced apart along the longitudinal axis (L), wherein the piping arrangement comprises: an outer pipe body ; and an inner sleeve made from a polymeric material, the inner sleeve being disposed within the outer pipe body , and wherein the inner sleeve defines the measurement section and the fluid passage of the piping arrangement , characterized in that the outer pipe body is made from a metallic material, and wherein the inner sleeve is over molded within said outer pipe body , and each of the at least two reflective elements is disposed on a respective bracket inserted in the fluid passage , and, preferably, each bracket is removably inserted in a slot defined in an interior surface of the inner sleeve and extending along the longitudinal axis (L) from a respective one of the first end and the second end of the tubular body to the measurement section . an outer pipe body ; and an inner sleeve made from a polymeric material, the inner sleeve being disposed within the outer pipe body , and wherein the inner sleeve defines the measurement section and the fluid passage of the piping arrangement , characterized in that the outer pipe body is made from a metallic material, and wherein the inner sleeve is over molded within said outer pipe body , and each of the at least two reflective elements is disposed on a respective bracket inserted in the fluid passage , and, preferably, each bracket is removably inserted in a slot defined in an interior surface of the inner sleeve and extending along the longitudinal axis (L) from a respective one of the first end and the second end of the tubular body to the measurement section . <EOS>