The Model QRNG 340 is an aircooled, two stage, two cylinder, pressure lubricated compressor, capable of handling inlet pressures of -7.5 PSI (15 in. mercury) up to 30 PSI. A maximum of 400 PSI discharge pressure can be produced (with proper controls and modifications). It has a 5.25" low pressure bore and a 3.00" high pressure bore, with a 3.50" stroke. The Model QRNG 340 can be run at 400-900 RPM.