Features: Compact Demand Valve (CDV)
1st breath activated for "instant on"
Rugged, compact design delivers high flow rates
Screw-on-design allows for DIN 40 thread
With the option to mount on either side of the mask, it is unobtrusive and allows excellent integration with weapons and other personal equipment.
Gauge & Whistle
Located on shoulder straps for easy access
Positioned for high noise environments and easy gauge reading
Illuminated gauge for low-light situations
Stealth Appearance
Black low profile design
Lightweight compared to traditional SCBA units
Silent operation for critical missions
Comfort
Ergonomically contoured backframe for comfort
Adjustable harness allows for quick donning / doffing
Padded shoulder straps for comfort

The ST53 combines Avon Protection's FM53 mask technology with an advanced modular breathing apparatus to provide positive pressure SCBA and/or PAPR capability for specialist operations.

Developed with the unknown elements of a threat scenario in mind, the ST53™ is the most advanced CBRN respiratory solution on the market. It enables a fast response to changing operational conditions in one complete modular system.

A switch between negative (filter) and positive (SCBA) pressure is achieved at the flick of a lever on the front of the mask. And by attaching a short (ST53SD) or long duration compressed air cylinder, it is possible to enter a location on filter mode, assess the situation and change to SCBA mode if the need arises.

The SCBA systems, benefiting the wearer with reduced weight and size compared to traditional systems.

The patented combination hose allows the user to switch modes in one simple action