The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking procurement for valve assemblies under the presolicitation notice titled "16--VALVE ASSEMBLY,ENVI." The requirement includes the acquisition of two units of NSN 7R-1660-016686584-P8, with reference number 423785-3, and delivery is expected to be made FOB origin. These valve assemblies are critical components used in aircraft air conditioning, heating, and pressurizing systems, highlighting their importance in maintaining operational readiness and comfort in military aviation. Interested vendors should direct inquiries to Amelia C. Toften at (215) 697-6514 or via email at AMELIA.TOFTEN@NAVY.MIL for further details regarding the procurement process.