The SDI Diagnostics PulmoGuard II PFT Filter Kits with 1-Inch Outer Diameter (O.D.) Mouthpiece & The Klip are high-efficiency, single-use respiratory safety packages designed to optimize clinical workflow during pulmonary function testing (PFT). Engineered by SDI Diagnostics, this specialized clinical convenience kit combines a pleated electrostatic barrier filter with an integrated port profile and an included nasal clamp inside a single hygienic wrapper, eliminating the need to source or open separate accessory packs.