Petzl Tandem Speed Pulley moq12 you can directly attach the

you can directly attach the SR905 hose to the mask

the Half Masks clip quickly onto the power units and are easily unclipped for cleaning

It is also used on  of Sundström's threaded gas filters when used on the SR500 PAPR

Compatible for deep roof profiles and structures

Petzl Tandem Speed Pulley moq12 you can directly attach theA double in line pulley designed for Tyrolean traverses on cable or rope, the TANDEM SPEED has stainless steel sheaves mounted on sealed ball bearings for excellent efficiency. It accepts up to three karabiners to facilitate manoeuvres. Features: Stainless steel sheaves for excellent durability Sheave mounted on sealed ball bearings for excellent efficiency Accepts up to three karabiners to facilitate use Specifications: Rope compatibility: diameter: