A transducer assembly (108, 110, 112, 116, and 120) comprising: a coupling member comprising: a first end that has a first counterbore ; a second end opposite the first end, the second end having a second counter bore; a first electrical pin disposed within the first counterbore ; a second electrical pin disposed within the second counterbore, the second electrical pin electrically coupled to the first electrical pin ; and a flange portion disposed between the first end and second end, the flange portion configured to couple the transducer assembly (108, 110, 112, 116, and 120) to an exterior surface of a spool piece of an ultrasonic meter , the flange portion defining a plane normal to a central axis of the coupling member ; a piezoelectric module with a piezoelectric element , the piezoelectric module disposed at least partially within the first counterbore , the piezoelectric element residing wholly on a first side of the plane ; a transformer module with a transformer disposed therein, the transformer module disposed at least partially within the second counterbore, the transformer module residing wholly on a second side of the plane opposite the first side; and an electrical conductor disposed within a passage 840 through the coupling member , the electrical conductor coupling the transformer to the piezoelectric element . a coupling member comprising: a first end that has a first counterbore ; a second end opposite the first end, the second end having a second counter bore; a first electrical pin disposed within the first counterbore ; a second electrical pin disposed within the second counterbore, the second electrical pin electrically coupled to the first electrical pin ; and a flange portion disposed between the first end and second end, the flange portion configured to couple the transducer assembly (108, 110, 112, 116, and 120) to an exterior surface of a spool piece of an ultrasonic meter , the flange portion defining a plane normal to a central axis of the coupling member ; a first end that has a first counterbore ; a second end opposite the first end, the second end having a second counter bore; a first electrical pin disposed within the first counterbore ; a second electrical pin disposed within the second counterbore, the second electrical pin electrically coupled to the first electrical pin ; and a flange portion disposed between the first end and second end, the flange portion configured to couple the transducer assembly (108, 110, 112, 116, and 120) to an exterior surface of a spool piece of an ultrasonic meter , the flange portion defining a plane normal to a central axis of the coupling member ; a piezoelectric module with a piezoelectric element , the piezoelectric module disposed at least partially within the first counterbore , the piezoelectric element residing wholly on a first side of the plane ; a transformer module with a transformer disposed therein, the transformer module disposed at least partially within the second counterbore, the transformer module residing wholly on a second side of the plane opposite the first side; and an electrical conductor disposed within a passage 840 through the coupling member , the electrical conductor coupling the transformer to the piezoelectric element . <EOS>