Product Name: CPR Training Mask One-Way Valves Our disposable CPR training valves are specially designed to match standard CPR training masks, ideal for professional first aid practice without cross-contamination risks. Disposable & Sanitary Safety Single-use design completely avoids cross-infection between trainees, ensures hygienic training environment for students, medical staff and rescuers. Built-in one-way breathing structure blocks backflow of exhaled air, greatly enhance training safety. Wide Universal Compatibility Standard interface fits most common CPR face masks on the market, perfectly compatible with adult, child training masks, no extra adapters required, easy to install and replace quickly during intensive training courses. Lightweight & Simple Operation Light transparent plastic body with bright yellow outlet connector, easy to observe internal structure during teaching demonstration; plug-and-play design, trainers can replace valves in seconds to improve training efficiency. Wide Application Scenarios Perfect supply for first aid training institutions, medical colleges, hospitals, fire departments, school safety classes, private CPR trainers and individual practice use. Bulk wholesale available for training center procurement. Stable & Reliable Structure Strictly manufactured with medical-grade transparent PVC material, smooth air circulation, stable one-way airflow resistance, highly restore real CPR breathing experience for more realistic simulation training.