LT Plus Series: High Pressure Three Phase Oil Lubricated Tank Mounted Air Compressors with 20 gallon capacity, 2HP The LT Series tank mounted, oil lubricated air compressors are mounted on ASME air receivers to offer further ease of installation and versatility. This tank mounted air compressor is specifically designed to fill systems to 40 PSI in 30 minutes as per NFPA 13.