This is a Sources Sought notice for market research to identify potential suppliers for a Pump Unit, Reciprocating, with the only approved source currently being High Pressure Equipment Company. The proposed contract is a 5-year Firm Fixed Price, Indefinite Delivery Indefinite Quantity (IDIQ) with an estimated quantity of 12 to 60 units. The applicable NAICS code is 336412, with a size standard of 1,500 employees. No budget amounts or performance location are specified. Interested parties should respond with company details and business size/socio-economic status.