This is a sole-source procurement for 134 units of an NSN 1560 part that is a Critical Safety Item. The part requires Government source approval due to its flight-critical nature and inadequate technical data for full competition, with only previously approved sources solicited. New sources must submit required technical data per the NAVSUP WSS Source Approval Brochure, and award cannot be delayed pending new source approval. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible parties may express interest or submit capability statements. Delivery is FOB Origin.