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Air Compressor Pump: Pump compresses air into tank. Check Valve: When unit is operating, Check Valve is open, allowing air to enter tank.At “cut-out” pressure, Check Valve closes, preventing air from flowing back into pump.Valve is not serviceable by user. Data Tag: (not shown) The data tag contains serial number, model number, and revision number information. Drain Valve: Valve is located near bottom of air tank and is used to drain condensation. Overload Protector: If motor overheats, overload