The Quincy QT-5 Basic Air Compressor Pump is a replacement pump for 3 & 5 HP Quincy QT compressors. This dependable two-stage, splash-lubricated cast iron pump runs at slower RPM to prevent overheating, last longer, create less wear and tear, and save electricity. Extra capacity oil reservoir. Industrial-class bearings for long operating life. Cast iron cylinders. Graphite cylinder and head gaskets. ASME-code interstage pressure relief valves. Aluminum head for strength and heat dissipation. Efficient stainless steel valves. Fan type cast iron flywheel. Balanced counterweighted crankshaft for smooth operation. High-efficiency fin and tube intercooler.