Vacuum secondary diaphragm compatible with carburetor models 135-2, 135-4, and 135-11.Designed for use with 390, 600, and 750 CFM carburetors.Fits part numbers 1849, 1850, 3310, 6619, 6909, 8007, 9834, 80457, 80463, 80508, and 80529.Matches OEM specifications for performance and proper fitment.This is a replacement item from an aftermarket supplier.References to brand names are for compatibility identification only. This is an independent replacement component.References to brands or models are solely for compatibility indication.