New Secondary Smog Air Pump For GMC Buick Cadillac Chevy Oldsmobile 12574379 New 04-05 Trailblazer Envoy Ascender 4.2L Secondary Air Injection Pump 12574379 OEM: 12574379, 33-2402M, 15097130, 722621250, 728056070 High Quality OEM Replacement Part Easy installation Please verify fitment (model / year) before purchasing this product. To see if this item is compatible with your car, SEE THE PRODUCT DESCRIPTION SECTION / BELOW.