This kit contains special screens that are needed in the A/C system to trap metal particles that will cause a compressor to fail. A screen is installed when a compressor is replaced to protect the new compressor from damage from any residual debris in the system that flushing might not have removed. GM-44551-A is a universal kit that contains all the removal and installation tools and suction screen sizes to service all GM vehicles including Saturn, Saab and Hummer.