Mack 1MR572 Turn Signal Switch PAI 4241CROSS REFERENCE: 1MR572 25025234 APPLICATION: Mack Multiple Use Application. DETAILS: Turn Signal Switch 7 Wire Connector. BRAND: PAI 4241 Mack 1MR572 Turn Signal Switch PAI 4241. Heavy duty truck parts and diesel truck parts. Provides precise control and maintains consistent signal function. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty