Space Chamber Compact Medium Mask Anti-static, no priming required: Allows maximization of aerosol medication suspension time. Does not need priming and can be used straight out of the package. Cross Valve Technology: Designed to provide low resistance when breathing in your medication and allows easy breathing out of the chamber. Compatible with most pMDI's: Universal inhaler base fits most pressurized metered dose inhaler (pMDI) brands. Base fits securely yet removes easily for cleaning. Transparent Chamber: Allows a clear view of the valve movement and enables direct confirmation of correct use by patients. Dishwasher safe: Base can be removed for easy cleaning either by hand or in the dishwasher. Free from PVC, BPA, Latex and Phthalates