Dive Alert Orange Surface Marking Tube { 5.4 ft | 1.6 m }
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Dive Alert Orange Surface Marking Tube { 5.4 ft | 1.6 m }
- Inflate the SMT on the surface or at depth
- { 5.4 ft | 1.6 m } long by { 8 in | 20 cm } wide
- Over pressure valve (OPV) prevents over-inflation
- Baffle prevents air from releasing at the surface
- Top strap provides an attachment point for a strobe
The value priced Dive Alert™ Orange SMT is { 5.4 ft | 1.6 m } by { 8 in | 20 cm } and inflated with your second stage regulator. The nylon strap at the top provides an attachment point for a light or slate and two strips of reflective tape across the top significantly increase visibility. Constructed of durable 400 denier polyurethane coated nylon material in high visibility orange on both sides and including two hook and loop straps at the bottom to retain a tidy compact roll for storage.
The semi-closed design is a hybrid of open and closed types that is open at the bottom and incorporates an funnel-shaped (aka 'duck-bill') internal baffle that allows the tube to be inflated as usual with a regulator second stage at depth, but prevents the tube from unintentionally deflating should it fall over while on the surface. The hybrid marking tube includes an over pressure valve (OPV) to allow excess gas to vent during ascent and a pull dump to deflate the bag before boarding the boat or when being rolled up for storage.
NOTE: The hybrid SMT is not fully closed by design and if you inflate it when dry (i.e. at home, to 'test' it), you will discover gas slowly leaks out through the bottom baffle. This does not cause a problem in actual in-water use, where the water will cause the baffle to seal. Although a marking tube should not be used as a lift bag, for emergency purposes a fully inflated tube may be considered to have approximately { 13 lb | 6 kg } of lift when completely submerged.
| Brand | DiveAlert |
|---|---|
| SKU | DAL-DMB1 |
| Weight | 0.600000 |
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What Color is Your Parachute Bag?
Studies done in the transportation sector prove the best color for high visibility worker clothing is fluorescent safety orange because that color is the most visible from the greatest distance. A fluorescent yellow-green color, while not as visible at distance, offers better night visibility and is also a better choice for signage because it provides more contrast for lettering.
Some groups of divers have informally assigned meaning to bag color. Shooting an orange bag or marker is supposed to indicate a normal situation to surface support. The appearance of a yellow color may mean that the diver has an abnormal situation and requires assistance from the surface. However, there is no color standard along with considerable confusion about color.
Our recommendations: If visibility is most important, then orange is proven by far to be the best color choice for distance visibility during daylight hours. Choose yellow for night visibility, or for a day and night compromise we offer a marking tube that is yellow on one side and orange on the other. We respectfully suggest reconsidering any dive plan which depends on the color of a bag to signal for help.
