The Problue AC-37-7A Alert Marker 4.2 ft is a surface marker buoy from Problue – your signal to the boat that you’re coming up. Bright, visible, and easy to inflate, it’s the single most important piece of safety gear you carry on every ascent at Perhentian’s crystal-clear waters.
Technical Specifications
| Specification | Details |
| Brand | Problue |
| Product | AC-37-7A Alert Marker 4.2 ft |
| Size | 1.5m |
| Material | Nylon |
| Inflation | Oral inflator |
| Colour | Orange / Red |
| Best For | Safety ascent / Surface signalling |
Key Features
- Bright orange / red: Visible from the surface – the boat will see you coming up.
- Easy inflation: Oral inflator lets you inflate it at any depth with a single breath.
- Durable nylon: Holds shape and colour after years of use.
- Compact when folded: Fits in a BCD pocket – always with you.
Suited for Malaysian Dive Sites
The Problue AC-37-7A Alert Marker 4.2 ft is built to perform across Malaysia’s best underwater destinations. Whether you’re exploring Perhentian’s crystal-clear waters, or heading to new reefs and wrecks, this gear delivers the reliability and comfort you need on every dive.
Care & Maintenance
- Rinse after every use – salt and sand clog the inflator.
- Inflate and deflate a few times while rinsing.
- Dry fully before folding – mildew inside the buoy is a problem.
- Inspect the seam and inflator hose for wear.
Final Verdict
The single most important piece of safety gear you carry on ascent. The Problue AC-37-7A Alert Marker 4.2 ft is bright, easy to inflate, and reliable – always have one.





Sharon Lee –
What kind of maintenance is required for this Problue AC-37-7A Alert Marker 4.2 ft?
Imran Hanafiah –
Thank you for reaching out about the Problue AC-37-7A Alert Marker 4.2 ft. To answer your question, the product requires minimal maintenance. The included dump valve should be checked periodically to ensure it’s functioning properly, and the oral tube should be inspected for any blockages or damage. Additionally, storing the product in a dry environment and away from direct sunlight can help prolong its lifespan. If you have any more questions or concerns, please don’t hesitate to ask.
Daniel Ng –
Are there different sizes available for this Problue AC-37-7A Alert Marker 4.2 ft?
Imran Hanafiah –
Hello Daniel, thank you for reaching out to us about the Problue AC-37-7A Alert Marker 4.2 ft. Yes, we do have other sizes available for this product. Some of the alternatives are the 6.9ft and 8.2ft lengths. If you’d like to explore these options or have any further questions, feel free to reply to this message. We’re here to help.
Emily Tan –
Since I purchased this Problue AC-37-7A Alert Marker 4.2 ft, I have been able to safely alert my team when handling hazardous materials. Its durable construction and ease of use make it a valuable addition to our emergency response kit.
Lin Tan –
The value for the price of this Problue AC-37-7A Alert Marker 4.2 ft is good. While the product itself has been satisfactory, the minor issue of a slight discoloration after being exposed to chemicals did not deter me from using it.
Kevin Tham –
I was pleased with how quickly this Problue AC-37-7A Alert Marker 4.2 ft arrived at my doorstep. The packaging was secure, and I had no issues with the contents.
Amanda Quek –
What would be the ideal material for this Problue AC-37-7A Alert Marker 4.2 ft to be made of?
Junhao Lo –
Thank you for your review and for choosing Problue AC-37-7A Alert Marker 4.2 ft. We’re glad you’re interested in the material of our product. For alert markers like ours, it’s essential to use durable and water-resistant materials that can withstand various environments and situations. We use a type of nylon that’s specifically designed for these types of applications. It’s a great balance of strength, flexibility, and resistance to chemicals and abrasion. We believe this material choice helps ensure the marker performs well in various situations, such as emergency response and training. Would you like to know more about our product’s design and functionality?