k electrical circuitry not shown in the figure is adapted to provide an electrical current to electrode 715 and electrode 710 upon receipt of a release signal the electrical current weakens the adhesive bond causing electrode 715 and electrode 710 to slide past each other under the compressive force from spring 705 the contraction of spring 705 draws holding clips 720 from slot 322 and the extension forces from release springs 275 c urges separation of housing 250 k from coupling 320 k other embodiments are also contemplated wherein a weakened disbonding adhesive provides a trigger for the separation of a housing and coupling in one embodiment the housing is separated from the coupling upon receipt of a wireless signal the wireless signal according to one embodiment includes an audio frequency signal propagated through the plumbing system fig1 illustrates piezoelectric transducer 31 5 a affixed to circuit board 305 by riser 490 riser 490 includes an annular mounting surface for affixing piezoelectric transducer 315 a to circuit board 305 riser 490 in one embodiment is fabricated of molded plastic piezoelectric transducer 315 a is positioned a distance of approximately u00bc wavelength away from circuit board 305 and an electrical signal is conducted using wires 495 0066 fig1 illustrates local unit 600 for generating audio.