The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two reciprocating pumps, identified by NSN 0R-4320-016954855-TX and reference number 4252AS0261-1. The procurement is critical due to the unstable design of the part, which has demonstrated marginal performance and requires government source approval prior to contract award, as it is flight critical. Interested vendors must provide detailed technical data and evidence of previous approvals, as offers lacking this information will not be considered. For inquiries, interested parties can contact Bridget M. Murphy at (215) 697-5047 or via email at BRIDGET.M.MURPHY6.CIV@US.NAVY.MIL.