Martech's Model 50 Single Line Hose System, No. SL, works with existing compressed air supplies to provide Grade "D" Breathable Air for a NIOSH approved respirator. Designed to work with a provided 54" tool air hose, it supplies air for a spray gun, all via the included single line hose assembly. The four stage filtration, filters the air, and the on board carbon monoxide monitor continuously monitors the air quality for compliance with current OSHA standards. Accessories can increase or decrease the temperature of the air supply for improved user comfort. Each system is backed by a one year warranty.