The Type T217 is one of a series of underwater transducers available from Neptune that are designed for use in transponders, beacons, acoustic release mechanisms and data communication systems.

This versatile transducer combines efficient broad band transmission and reception suited to submarine range tracking applications on underwater trials ranges.

The nylon base incorporates three threaded fastenings and an 'O' ring seal allowing simple and direct mounting onto equipment or pressure housings. Electrical connection is via a twisted screen pair cable.