Description OEM circuit board for Surge Air Injector #3 in drawing. PCB Circuit board for GEA Surge Air Injector Made in USA by GEA Farm Technologies Inc. WestfaliaSurge Related Items; 7750-0117-309 Air Valve 7750-0021-134 Thyrector 7750-0213-619 Air Filters 7750-0112-918 115 volt replacement valve only (current in 2020) 7750-0033-435 115 volt S30 replacement valve (Earlier models) 7750-0013-640 GEA Surge High Volume air Injector Control 7750-0013-302 GEA Surge High Volume air Injector Control Updated 7/26
