CamelBak® has made it easy to attach a standard reservoir (for training) or chemically resistant reservoir to your protective gas mask. For most protective masks, it only takes a second to snap the HydroLink™ Protective Mask Adapter into place. TYPE-A: Adapter fits S10, FM 12, and JSGPM (XM-50) protective masks. WARNING! Use in a chemical environment requires CamelBak’s Chem Bio Reservoir™ 4.0 (CBR 4.0)..