OKAY MOTOR Secondary Air Pump for 2000-2002 GMC Chevrolet Silverado Express Suburban Savana Secondary Air Injection Pump for 2000-2002 GMC Chevy Olds 2.2 4.3 5.7 8.1L Part #: 12563085, 12568324, 17803251 New Aftermarket Replacement Unit. 180-days Manufacturer Type Warranty Limited Applications: Express, savana. All models. 2.2l. S-series. Pump only. 4.3l, 5.7l, 8.1l. 4.3, 4.8, 5.3 & 8.1L, 4.3, 4.8, 5.3 & 8.1L.