WABCO MERITOR MACK/VOLVO SYSTEM SAVER 1200UP AIR DRYER 85122949 COALESCING CARTRIDGE, CORE GROUP 432421011; CROSS REFERENCES WABCO 4314210337 & MERITOR R955082. FITS MACK & VOLVO TRUCKS FULL VEHICLE AIR COMPRESSED SYSTEM, INCLUDING AIR BRAKE SYSTEM (PRIMARY), AIR SUSPENSION SYSTEMS, & AUXILIARY AIR SYSTEMS (IF EQUIPPED). THIS SITS IN THE COMPRESSED AIR CIRCUIT TO REMOVE MOISTURE BY USING A DESICCANT CARTRIDGE TO DRY AIR PREVENTING FROZEN AIR LINES IN WINTER & RUST INSIDE TANKS AND VALVES. IT ALSO REMOVES OIL & CONTAMINANTS WITH COALECING FILTER TRAPS WHILE PROTECTING THE ENTIRE AIR SYSTEM. THE FUNCTION KEEPS BRAKE VALVES, AIR TANKS, & SUSPENSION COMPONENTS CLEAN AND WORKING PROPERLY.