Martech 75515 This complete, panel mounted system is ready to use. The four stage filtration, with auto float drain, filters the existing compressed air source and the on board monitor , continuously monitors the air for Grade "D" Breathable Air quality . This system is complete with a 50' single line hose system including a 54" tool hose for your spray gun. Then the breathing air hose is finished with a point of attachment pressure regulator, gauge, and quick coupler to connect your NIOSH approved hood or mask.