Features: 
Replaces OE part number: 12580681. 
Applicable model: the fuel injectors are fit for Buick Rainier 8 Cyl 5.3L 2005-2007. 
Premium material: the injectors are made of metal and composite ABS plastic, function more consistent and smoother, more accurate adjustment to account for extremes of cold temperatures, fast starting up.
Function: the injector is a fuel delivery component that is responsible for injecting gasoline or fuel into the combustion chamber, a valve that primarily receives and delivers fuel to the cylinder. It is electronically controlled to open and close completely or partially, depending on the data collected by various sensors.
Optimize fuel efficiency: the fuel injector is a precision-engineered component designed to deliver the perfect fuel spray pattern for optimal combustion. By ensuring precise fuel atomization, this fuel injector improves engine performance, fuel efficiency, and reduces emissions.
Improved engine performance and reduced emissions: by ensuring precise fuel atomization, these fuel injectors helps optimize combustion efficiency, optimizing fuel atomization (mist) for increased performance and fuel economy. This not only enhances your vehicle's performance but also contributes to a cleaner environment. 
Easy installation: the nozzles are engineered to meet or exceed original specifications, ensuring a perfect fit for your vehicle's fuel injection system.

Specification: 
Product name: Fuel Injector Spray Nozzle 
Material: plastic 
Color: black 
Attachment method: push in
Connector gender: female
Connector shape: rectangular
Fuel injection type: multi port
Fuel type: gas
Gasket or seal included: Yes
Compatible with OE part number: 12580681
Interchange part number: 12580681, 217-1621, 832-11203 FIGM004X8, 19421333
Superseded part number: 12580681, 217-1621, 58100N 6818, 19421333
Nozzle: 2 hole 

Fitment: 
For Buick Rainier 8 Cyl 5.3L 2005-2007 
For Cadillac Escalade 8 Cyl 6.0L, 8 Cyl 6.2L 2007-2009 
For Chevrolet Avalanche 8 Cyl 5.3L, 8 Cyl 6.0L 2007-2009 
For Chevrolet Colorado 8 Cyl 5.3L 2009
For Chevrolet Express 8 Cyl 4.8L, 8 Cyl 6.0L 2008-2009 
For Chevrolet SSR 8 Cyl 6.0L 2005-2006 
For Chevrolet Silverado 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L 2007-2009 
For Chevrolet Suburban 8 Cyl 5.3L, 8 Cyl 6.0L 2007-2009 
For Chevrolet Tahoe 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L 2007-2009 
For Chevrolet Trailblazer 8 Cyl 5.3L, 8 Cyl 6.0L 2005-2009 
For GMC Canyon 8 Cyl 5.3L 2009
For GMC Envoy 8 Cyl 5.3L 2005-2009 
For GMC Savana 8 Cyl 4.8L, 8 Cyl 6.0L 2008-2009 
For GMC Sierra 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L, 8 Cyl 6.2L 2007-2009
For GMC Yukon 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L, 8 Cyl 6.2L 2007-2009 
For Hummer H2 8 Cyl 6.2L 2008 
For Hummer H3 8 Cyl 5.3L 2008-2009 
For Hummer H3T 8 Cyl 5.3L 2009