Heavy-duty industrial 2-stage duplex air compressor systems protect your business from expensive downtime! The duplex compressor includes two compressors and two motors mounted on an ASME horizontal tank. Each system can be run independently or together, should your air demand require it. Works in applications from intermittent duty to 100% duty requirements. 1-year limited warranty without extended warranty kit purchase. Purchase two extended warranty kits (Item# 42637, one for each compressor) at the same time (on the same receipt) as your Quincy 120-gallon duplex air compressor and register online within 10 days of receipt, and it will double the package warranty to 2 years and triple the pump warranty to 3 years (parts and labor).