3m scotch-weld 50ml cartridge transition conversion kit for structural adhesives - epoxy mmm-3m scotch-weld transition kit to help customers with converting to 3m's new 50ml duo-pack cartridge design. 3m(tm) scotch-weld(tm) epx cartridge transition conversion kit, for manual epx applicators for the new 1:1, 2:1. 3m scotch-weld duo-pak cartridges in 48.5ml and 50ml sizes. kit includes 12 epx square-green mixing nozzles in the new design (b-system-screw-on style), one new shared/universal epx plunger for 50ml dispensing guns (that works with the new cartridge design) , and one 3m orientation & instruction sheet. 3m has moved from a traditional bayonet cartridge to the sulzer b-system cartridge. while this new b-system cartridge does offer a number of advantages and advancements, it also requires a different static mixer nozzle and in some cases a different cartridge extrusion plunger and/or cartridge gun. this kit was built by 3m to help/simplify the transition of customers to using the new cartridge system.