5500 Series Half Mask with 2 Defender Multie Purpose/P100 cartridges Sizes Medium 5500 series half mask It contains 2 defender multi purpose and P100 cartridges Ideal as a visitor respirator you can hand out to your sub-contractors and plant guests All parts are replaceable Available in medium size 5500-Series half mask It contains 2 defender multi purpose and p100 cartridges Ideal as a visitor respirator you can hand out to your sub-contractors, plant guests and other occasional users of respirators All parts are replaceable Available in medium size