The U.S. Coast Guard is seeking quotations for 12 units of a specific 5-inch wafer-style check valve for the saltwater supply to a main diesel engine, with an acceptable replacement part identified. Award will be made on a firm fixed-price, lowest price technically acceptable basis, and the contract is set aside for small businesses under NAICS 332911. Quotations must be submitted via email by the specified deadline, and offerors must be registered in SAM with a valid DUNS number. All items must be individually packaged and marked in strict accordance with military standards, as standard commercial packaging is unacceptable. No budget amount or location for performance of services is specified in the description.