The Navy seeks a firm-fixed-price procurement of one H2S Detector System (NSN 6635 LLCYD2061) to reference 20706467-3/CAGE 3CX85; the Government does not own the drawings or data rights. Pricing must exclude shipping, freight is FOB Origin, and DCMA source inspection/acceptance plus military packaging and bar coding are required. Offerors must provide their CAGE, unit price and FFP status, procurement and packaging CAGEs, delivery days, and quote validity; distributors/dealers must include manufacturer authorization or dealer/OEM traceability documentation. Because this is a first-time Navy procurement, an informal cost breakdown and/or redacted sales receipt may be requested to support fair-and-reasonable pricing, and the order will be issued under Emergency Acquisition Authority. Quality requirements include MIL-STD-130 marking, MIL-STD-2073 packaging, and retention of inspection records for 365 calendar days after final delivery.