The requirement is for Hydrophone Transformers used in TR-333 Hydrophones for the submarine Navigation Subsystem, as replacement assets during normal refit/replenish/replacement operations. The Government intends a sole-source ceiling increase on a firm-fixed-price, indefinite-delivery/indefinite-quantity contract with a five-year ordering period, raising the ceiling from $1,027,919 by an estimated $1,800,000 to an estimated $2,827,929. The approved and original source is OECO LLC of Milwaukie, OR, and the sole-source rationale includes avoiding substantial duplication of cost, unacceptable delays, and certification testing costs/delays for highly specialized equipment. All responsible sources may submit a capability statement, proposal, or quotation for consideration, though the Government retains discretion over whether to compete the action. Contractors must be properly registered in SAM.