The National Institute of Standards and Technology (NIST) is conducting market research to identify sources capable of supplying a specific Pfeiffer Vacuum A100L Pump (Model A100L31324) as an exact replacement for a broken unit in a dilution refrigerator used for ultra-low temperature experiments. The pump must match the existing model’s footprint, connections, and technical specifications, including a pumping speed of 100 m³/h and ultimate pressure of 0.012 hPa. No budget amount is specified in this sources sought notice. The location for performance is not explicitly stated, but the pump will be used at NIST facilities. Responses are requested as soon as possible, preferably before the notice’s closing date, with no formal solicitation or award resulting from this notice.