The Department of Defense, through the Naval Undersea Warfare Center Division Newport (NUWCDIVNPT), is seeking sources for the production of DT-511C and DT-592D hydrophones and associated spare parts. The procurement involves establishing a five-year indefinite delivery/indefinite quantity (ID/IQ) contract on a Firm Fixed Price (FFP) basis, requiring the contractor to design, manufacture, test, and deliver up to three First Article Hydrophones and up to 650 production hydrophones, along with up to 100 spare parts for each model. These hydrophones are critical for the Navy's fleet operations, supporting both surface ships and submarines. Interested parties should submit their capabilities and responses by providing company information and a technical white paper, with inquiries directed to Kerin Prairie at kerin.m.prairie.civ@us.navy.mil or Keri Gunn at keri.l.gunn.civ@us.navy.mil.