Half-Mask Respirator & Replacement Chermical Combination Cartridge $50 Used for a week then stored away. Selling Mask and Replacement for $50 Elastomeric respirators are designed for repeated cleaning and decontamination resulting in dramatic cost savings over filtering facepiece respirators. The Advantage 290 does not have an exhalation valve which allows for filtration of exhaled air, thereby providing a means of source control and use in a sterile field environment. Overmolded MultiFlex nosecup provides stability on the user's face while maintaining a fit. Anthrocurve facepiece design maximizes fit and comfort and reduces potential leak points. Pickup Only. Near Royal Jubilee Hospital.