The SDI Diagnostics Spirotubes (Type H / Type P Pediatric Configuration) are premium, single-use respiratory testing accessories designed for precise pulmonary function evaluations, spirometry screenings, and peak flow monitoring in pediatric populations. Constructed with a specialized, reduced structural footprint featuring an approximate 20 mm to 21 mm inner diameter and a 22 mm to 23 mm outer diameter, these disposable tubes establish an airtight friction-fit connection over pediatric-sized flow sensors, standard PulmoGuard filters, and specialized pediatric peak flow devices (such as the Assess Peak Flow Meter). Fabricated with precision-cut, perfectly smooth ends, they optimize patient lip comfort and prevent mucosal irritation during intense forced expiratory maneuvers, which is particularly beneficial for keeping younger patients compliant during clinical assessments. The rugged composite walls possess an optimized structural thickness that actively resists moisture absorption, bending, or collapsing under firm teeth clenching, ensuring an unrestricted airway for highly accurate flow and volume measurements. This single-use format streamlines high-volume clinical workflows by offering an instant, hygienic barrier that minimizes cross-contamination pathways while completely eliminating the administrative time, labor hours, and equipment wear associated with chemical sterilization protocols between patient appointments. This specific product code designates the volume packaging configuration, supplying a master case of 500 total spirotubes organized internally as five convenient dispenser bags containing 100 individual pediatric pieces each.