ProPak Sigma is a self contained positive pressure breathing apparatus complete with PanaSeal positive pressure facemask in black Neoprene, lightweight rigid backplate with fully adjustable harness and adjustable webbing cylinder band. The backplate is manufactured from a lightweight composite material and includes a lumber pad. The fully adjustable body harness is fabricated from a flame retardent Kevlar blend webbing. Buckles and fittings are injection moulded from a corrosion resistant polyamide. The two stage pneumatic system features a first breath activated positive pressure demand valve, a first stage pressure reducing valve with an integral 200/300 bar cylinder connector and a shoulder mounted pressure gauge with 55 bar whistle. Apparatus accepts full range of Scott breathing apparatus cylinders from 4.7 to 9 litres capacity, 200 or 300 bar.* Apparatus is CE Marked to EN137:2006 Type 2 and MED approved