1527 - MEI CORP - The MEI Bosch Mini-Relay Harness Assembly 1527 works on 4 or 5 prong relay switches, it fits on models 1250, 1251 and 1252.PRODUCT SPECIFICATIONS:MEI Part No.: 1527AirSource: 1527MANEX: 08-00478Truck Air: 11-3102Fits 1250, 1251 and 1252