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 , 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 , 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 are elastic and arranged with respect to each other such that their respective recesses face each other and form a gap between the coupling members , 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 , 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 , 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 , 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 are elastic and arranged with respect to each other such that their respective recesses face each other and form a gap between the coupling members , 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 , 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 are elastic and arranged with respect to each other such that their respective recesses face each other and form a gap between the coupling members , and such that contact between the first and second coupling members, that would occur if there were no recesses, is avoided. <EOS>