The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of rotary pumps, identified by NSN 7R-4320-014769045-QE, with a quantity of 41 units required. This procurement necessitates engineering source approval due to the flight-critical nature of the item, which mandates that only approved sources with the requisite design capability and manufacturing knowledge may participate. Interested vendors must submit detailed qualifications and technical data as outlined in the NAVSUP Source Approval Information Brochures, as proposals lacking this information will not be considered. For inquiries, interested parties can contact Gina P. Sassane at (215) 697-2198 or via email at GINA.P.SASSANE.CIV@US.NAVY.MIL, with proposals due within 45 days of the presolicitation notice.