Reliable helper for auto repair tasks: designed for safe operation and increased work efficiency; includes a dryer cylinder removal key and an air dryer replacement tool. Professional grade tool: built for automotive repair professionals; suitable for outdoor use on trucks; includes a dryer cylinder extraction key. Multifunctional maintenance tool: designed for maintenance and replacement of truck air dryer components, including air dryer filter replacement, air dryer canister extractor, and a replacement key tool. Universal applicability: suitable for different trucks; an essential addition to any mechanic toolbox; functions as a truck wrench and dryer cylinder removal tool. Use scenarios: - In a shop during routine fleet maintenance, remove and replace the dryer cylinder to service air lines and improve performance. - On-site or roadside service, extract the dryer canister and replace air dryer filters to restore proper operation. - In any mechanic toolbox as a universal tool for truck maintenance, enabling quick cylinder removal and component replacement.