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Technical Bulletin Bulletin No.: PRO-06-02 Subject: PH-2 Effective Date: 4/15/81 Page: 1 of 1 Air Horns In early 1979 the threads on air horn bells were changed from a ¾”-28 Thread (fine) to a ¾”-10 Thread (coarse). For service requirements, both the fine and coarse thread bells are available. Piece numbers are listed below. Please note on catalog page 06-A-1. ¾” – 28 Fine Thread ¾” – 10 Coarse Thread Long Bell (Chrome) 212678 293515 Long Bell (Unpainted) 239792 293516 Short Bell (Chrome) 212679 293518 Short Bell (Unpainted) 239793 293519
