OKAY MOTOR Secondary Air Injection Pump for Chevy Trailblazer GMC Envoy Oldsmobile Bravada DTS 4.2L Secondary Injection Air Pump for 04-05 Chevy Trailblazer GMC Envoy Oldsmobile Bravada DTS 4.2L Part #: 215-454, 12574379, 15097130, 7.22621.13.0, 7.22621.25.0, 7.28056.07.0 New Aftermarket Replacement Unit. 180-days Manufacturer Type Warranty Limited. Grade Type Regular