Spurious triple‐transit signals can be rejected through phase cancellation by rotation of one transducer with respect to the other or by use of a triangular‐shaped metal film in the path between parallel transducers. Rejection is facilitated by slightly limiting the aperture via mechanical surface loading. The technique is demonstrated to give high triple‐transit suppression in delay lines with 20‐electrode‐pair transducers that give specular acoustic reflections. The technique is not found to be useful for conjugate‐matched 5‐electrode‐pair transducers, which are shown to give acoustic reflections normal to the electrodes.