The National Institute of Environmental Health Sciences (NIEHS), Division of Translational Toxicology, Mechanistic Toxicology Branch, seeks to acquire one commercially available 384-channel liquid-handling pipetting head with a 5–125 µL operating volume for high-throughput liquid handling on 384-well culture plates, compatible with existing NIEHS 96/384 liquid-handling equipment. The required system must support translational toxicology research, including human-based microphysiological systems and advanced 3D cell models, and must include applicable installation, configuration, technical support, and user training while operating independently of NIEHS IT systems. Award is anticipated as a firm-fixed-price purchase order to a responsible offeror whose quotation meets all mandatory technical, functional, compatibility, operational, installation, and training requirements and offers a fair and reasonable total price. Offerors may propose any manufacturer’s product that meets or exceeds the requirements and must provide sufficient technical documentation, a compliance matrix, pricing, delivery schedule, warranty information if applicable, and country of manufacture. Required delivery is September 30, 2026, to NIEHS Rall Building 101, Laboratories E144-146, 111 T.W. Alexander Drive, Research Triangle Park, NC 27709.