3.1 Main components. Power no/off? Oil replace drain. Temperature gauge? High pressure hose. Pressure gauge? Quick connector. Water outlet? Intake air filter. Water inlet? Drain valve. Explosion-proof valve? 1st Safety valve. Pressure relief valve? Power cord socket. Oil level gauge? Water pump power socket. Atmosphere air is compressed through two stage cylinder to. Reach 20Mpa/30Mpa, 3000/4500 psi. And the air is filtrated by. Oil and moisture separator before filling in tanks. The condensate and oil are separate from air and drain from.