3m 6500 series reusable half masks 3m 70071668159 this reusable half mask from 3m8482 is ideal when tackling dirty and tough jobs protecting against gases vapours and particles the mask is equipped with a 3m flexible bayonet connection system allowing connection to a broad range of twin lightweight filters this version comes with a quick latch drop down mechanism for moving in and out of contaminated areas no need to remove your safety helmet or face shield when lowering or raisin