Pressure switch type offers simple control. More reasonable prices in comparison with previous TLD series . "COMG" oil-lubricating type provides easier and more economical operation. COMG embodies the high standards in basic performance, durability, safety and versatility. All models are equipped with totally-enclosed motors which prevent motor problems such as damage to bearings by dust or insulation deterioration by moisture. Rotating sections are covered by a totally-enclosed belt guard. High performance for professional use Two-way cooling system effectively releases compression heat (for 2.2kW and above).