Whengreaterforceisrequired,theFM2,FM3andFM4modelsutilizemultiplepistonsworkingtogethertogenerateuptofourtimestheoutputforceofasingleactuator.

Please segment the words:
When greater force is required, the FM2, FM3 and FM4 models utilize multiple pistons working together to generate up to four times the output force of a single actuator.