The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is soliciting proposals for the repair and modification of ECS valves, identified by part number 423775-1. The procurement aims to ensure that these critical components are overhauled, upgraded, and returned to a Ready for Issue (RFI) condition, adhering to stringent inspection and testing protocols as outlined in the Statement of Work. These valves are essential for aircraft air conditioning, heating, and pressurizing systems, underscoring their importance in maintaining operational readiness. Interested contractors should direct inquiries to Jessica Grzywna at 215-697-5095 or via email at JESSICA.GRZYWNA@NAVY.MIL, with proposals expected to comply with various quality and documentation standards as specified in the solicitation.