Over pressure relief valve (OPRV) for BCD, SMB, lift bag and other buoys. Includes a drawstring lanyard for easy attachment; quick to assemble and simple to use. Key features and benefits Purpose built for diving gear: compatible with BCDs, surface marker buoys (SMB), lift bags, and other buoyant devices. Easy attachment and use: attached with a drawstring lanyard for quick access and straightforward operation. Durable construction: ABS body, rubber washer, and a corrosionresistant steel spring; designed to withstand seawater immersion. Safe and controllable venting: allows rapid air removal as needed and helps prevent accidental overinflation during inflation. Lightweight and portable: designed to be light, strong, and easy to carry. Meets diving standards: provides overpressure relief for lifting bags and BCDs; can rupture to relieve excessive pressure when . Materials and build ABS body Rubber washer Corrosionresistant steel spring Seawater resistant design for immersion scenarios Performance and use Quick air release: you can vent air to suit the situation, helping maintain control during inflation and use. Overpressure relief: offers pressure relief for lifting bags and BCDs; serves as a safety mechanism in pressure situations. Portability: compact and portable for travel and field use. Use scenarios Lift bag operation: during salvage or underwater lifting, attach the OPRV to the lift bag; vent air quickly if overinflation is detected to maintain control. SMB deployment: connect to an SMB or buoyant device; use the valve to vent excess air as you set depth and buoyancy. Field travel and readiness: keep the unit attached via the drawstring lanyard to your gear; easy to deploy when preparing equipment for dive trips or work dives. This description preserves the original product's brand focus, specifications, models, and functions while presenting clear, customerfriendly benefits and practical use cases.