- Durable ABS body with a rubber washer and corrosion-resistant steel spring for a reliable seal and long-term durability. - Quick air release to match your needs and prevent accidental overinflation during inflation, helping you stay focused on the dive. - Overpressure relief valve (OPRV) designed for SMBs, lift bags and other buoys; comes with a drawstring for easy assembly and use. - Lightweight, strong and portable; provides overpressure relief to protect lifting bags and related gear while meeting diving standards. - Use scenarios: - Deploying an SMB: attach the device to the SMB and control air release to achieve the desired buoyancy during ascent or marking a position. - Lifting operations: use with lift bags to manage pressure and prevent overinflation or rupture during inflation. - Travel and field use: compact and portable, suitable for divers who need reliable buoyancy control gear on varying trips.