ABS body, rubber washer and corrosion-resistant steel spring. , can withstand the of seawater. diving standard with overpressure for / pressure relief for for lifting bag and , can rupture, light, strong, and portable. You can quickly remove the air according to your needs, and the accidental over-inflation during inflation, making you more focused on diving. Over pressure for (OPRV) for , SMB, lift bag and other buoys. Attached with drawstring lanyard, easy to assemble, easy to use. Specially designed for water sports, scientific design, professional equipment, materials, comfortable and .