The Semi‑Closed Buoy Dual‑Colour is a versatile, high‑visibility surface marker buoy designed for divers who need a reliable signalling device that combines rapid inflation with secure buoyancy retention. Featuring a distinctive dual‑colour design, this buoy enhances visibility in a wide range of surface conditions, making it an excellent choice for recreational divers, instructors, and technical divers who require dependable performance during ascent, drift dives, and decompression procedures.

The benefit of a dual-coloured SMB is that it allows divers to communicate visually with surface support teams. Different colours can signal different messages, such as a request for immediate pickup or that all is well. This visual communication can provide peace of mind and add an extra layer of safety.

The semi‑closed design supports flexible inflation methods:

• Alternate air source inflation — the open lower end can be placed over a second stage for rapid filling.
• Exhaled gas inflation — ideal for conserving gas or 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, ensuring stable buoyancy and preventing accidental deflation.

The SMB is constructed from high‑strength, abrasion‑resistant fabric designed to withstand repeated exposure to saltwater, UV light, and general wear. Reinforced seams provide long‑term durability, while the dual‑colour panels enhance visibility and help divers quickly identify the buoy’s orientation.

The semi‑closed lower opening is shaped to efficiently capture gas while minimising the risk of accidental release.

The Semi‑Closed Buoy Dual‑Colour typically includes:

• Open lower inflation section for rapid filling
• Sealed upper chamber to retain air and maintain buoyancy
• Dual‑colour high‑visibility fabric for enhanced surface recognition
• Reinforced attachment point for reels, spools, or lift lines
• 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 highly visible SMB