Sewerin FG 155 C Combiphon/Generator Acoustic Non-Metallic Pipe Locator for PVC, Poly, or AC PipeSewerin FG 155 C Combiphon with 10 W Generator Transmitter For Acoustic location of plastic pipes and Metallic Pipes Plastic pipes cannot be located by conventional electromagnetic means because they are not electroconductive. A different principle is applied when locating pipes using the acoustic method: The pipes transmit mechanical vibrations better than the earth that surrounds them. When the pipe is caused to vibrate appropriately, these