An improved oscillating positive expiratory pressure (“OPEP”) device, for respiratory therapy having a self sterilizing flow valve capable of insertion into the curved OPEP body without tools or aids. The flow valve is also tear resistant and incorporates a flared reinforced proximal end. To maximize the benefit to patients, the adjustable therapy selector is constrained from withdrawal and is dimensioned to accept commercially available, standardized respiratory fittings adaptors, mouthpieces and “Tees” that are capable of connection to multiple respiratory therapy devices or medicated aerosol delivery units. The aesthetics have been altered by the addition of an arced handle.
