An ultrasonic flow metering device comprising: a first coupling member, the first coupling member being configured for acoustically coupling a first ultrasonic transducer to a fluid conduit, the first coupling member comprising: a first face adapted to be connected to the first ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22, 24), wherein the at least one sidewall comprises a recess (40; 84) extending from the second face; a second coupling member, the second coupling member being configured for acoustically coupling a second ultrasonic transducer to the fluid conduit, the second coupling member comprising: a first face adapted to be connected to the second ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22,24), wherein the at least one sidewall comprises a recess (40; 86) extending from the second face; characterized in that the first and second coupling members (80, 82) are elastic and arranged with respect to each other such that their respective recesses (84, 86) face each other and form a gap between the coupling members (80, 82), and such that contact between the first and second coupling members, that would occur if there were no recesses, is avoided. a first coupling member, the first coupling member being configured for acoustically coupling a first ultrasonic transducer to a fluid conduit, the first coupling member comprising: a first face adapted to be connected to the first ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22, 24), wherein the at least one sidewall comprises a recess (40; 84) extending from the second face; a first face adapted to be connected to the first ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22, 24), wherein the at least one sidewall comprises a recess (40; 84) extending from the second face; a second coupling member, the second coupling member being configured for acoustically coupling a second ultrasonic transducer to the fluid conduit, the second coupling member comprising: a first face adapted to be connected to the second ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22,24), wherein the at least one sidewall comprises a recess (40; 86) extending from the second face; characterized in that the first and second coupling members (80, 82) are elastic and arranged with respect to each other such that their respective recesses (84, 86) face each other and form a gap between the coupling members (80, 82), and such that contact between the first and second coupling members, that would occur if there were no recesses, is avoided. a first face adapted to be connected to the second ultrasonic transducer and a second face adapted to be connected to the fluid conduit; and at least one sidewall connecting the first and second faces (22,24), wherein the at least one sidewall comprises a recess (40; 86) extending from the second face; characterized in that the first and second coupling members (80, 82) are elastic and arranged with respect to each other such that their respective recesses (84, 86) face each other and form a gap between the coupling members (80, 82), and such that contact between the first and second coupling members, that would occur if there were no recesses, is avoided.