Abstract: A pressure regulator for controlling a pressure supplied by an umbilical to a seismic source includes a frame configured to be located downstream from the umbilical and upstream from the seismic source; a dome piston valve supported by the frame and configured to receive compressed air with an input pressure Pin and to output compressed air with an output pressure Pout, smaller than the input pressure Pin; a pilot valve supported by the frame and configured to control the output pressure Pout; and wherein the pilot valve and the dome piston valve are configured to prevent a release of the compressed air into the ambient.

Abstract: A hydrophone includes a body formed of a flexible, plastic material. The body includes a plurality of channels and each channel may have one or more wells. The wells are adapted to receive an active element which includes mounting hardware. The mounting hardware includes a soft, rubber grommet or other means which suspends the active element, thereby permitting the flexing of the body without introducing that motion to the active element.