The Semi‑Closed Buoy 15/183 is a high‑visibility, versatile surface marker buoy designed for divers who need a reliable signalling device that balances ease of inflation with secure buoyancy retention. Measuring 183 cm in height and 15 cm in width, this buoy offers excellent surface visibility while remaining streamlined enough for effortless deployment from depth. Its semi‑closed design provides divers with multiple inflation options and dependable performance in a wide range of diving environments, from recreational drift dives to technical decompression procedures.

The semi‑closed structure allows for flexible inflation methods:

• Alternate air source inflation — divers can place the open lower end over a second stage to quickly fill the buoy.
• Exhaled gas inflation — ideal for conserving gas or when deploying from shallow depths.
• Low‑pressure inflator hose — compatible with standard BCD inflator fittings for controlled inflation.

Once inflated, the buoy’s internal structure channels air into the sealed upper chamber, preventing gas escape and ensuring the buoy remains upright and visible at the surface.

The buoy is made from durable, abrasion-resistant fabric designed to withstand repeated exposure to saltwater, UV light, and general wear and tear. Reinforced seams provide long‑term reliability, while the bright colour maximises visibility in challenging conditions.

The semi‑closed lower opening is shaped to allow efficient gas capture while minimising the risk of accidental deflation. The upper sealed section ensures the buoy maintains its shape and buoyancy even if submerged after deployment.

The Semi‑Closed Buoy 15/183 typically includes:

• Open lower inflation section for rapid filling using various methods
• Sealed upper chamber to retain air and maintain buoyancy
• Reinforced attachment point for reels, spools, or lift lines
• High‑visibility fabric for surface recognition
• Durable internal structure to channel and retain air effectively

Each component is designed to work together to provide a buoy that is easy to deploy, stable at the surface, and reliable across multiple dive profiles.

This buoy is suitable for:

• Recreational and training dives
• Drift diving
• Technical and decompression procedures
• Surface signalling for boat pickups
• Travel‑friendly dive kits requiring a tall, lightweight SMB