BP1000 Series Backpack Adapter For Use With 5500 7700 5400 7600 RU8500 Series Respirators no checkout Roughneck caps are built to Roughneck caps are built to provide exceptional crack resistance and handle hard knocks in the toughest places The P2A series tolerates heat up to 370° wile delivering a long service life under many adverse conditions The P2HN series is designed for high performance at extremely elevated temperatures up to 500° in these extreme environments Uni Cast™ construction of non ferrous materials eliminates sparking and won't absorb liquids No exposed metal on face Converts half mask or full facepiece to a welding respirator Puts cartridges on the back increasing service life and minimizing weight to facepiece