The Semi‑Closed Buoy 18/122 (T03020) is a versatile, high‑visibility surface marker buoy designed for divers who require a reliable signalling device that balances rapid inflation with secure buoyancy retention. Measuring 122 cm in height and 18 cm in width, this buoy offers excellent visibility at the surface while remaining compact enough for easy storage and streamlined deployment. Its semi‑closed design provides multiple inflation options and dependable performance across recreational, training, and technical diving environments.

The semi‑closed design supports flexible inflation methods to suit different dive scenarios:

• Alternate air source inflation — the open lower end can be placed over a second stage for quick, controlled filling.
• Exhaled gas inflation — ideal for conserving gas or when deploying from shallow depths.
• Low‑pressure inflator hose — compatible with standard BCD inflator fittings for precise 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 throughout ascent and at the surface.

The buoy is constructed from high‑strength, abrasion‑resistant fabric designed to withstand repeated exposure to saltwater, UV light, and general wear. Reinforced seams enhance durability, while the bright colour maximises visibility in challenging surface conditions.

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

The Semi‑Closed Buoy 18/122 typically includes:

• Open lower inflation section for rapid filling
• 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 compact yet visible SMB