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 (834, 844) disposed within a passage 840 through the coupling member, the electrical conductor coupling (834, 844) 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 (834, 844) disposed within a passage 840 through the coupling member, the electrical conductor coupling (834, 844) the transformer to the piezoelectric element.