NEW! North RU6500 Reusable Full FacepieceThis new facepiece is a redesign of the popular Sperian Survivair Opti-Fit™ full facepiece, which has been re-engineered to accept the North N-Series cartridges, filters, and cartridge/filter combinations. The RU6500 not only includes the preferred features and benefits from the Opti-Fit, but also features additional upgrades and improvements.The North full facepiece family already includes the North 7600 premium silicone mask and the North 5400 thermopla …