90P is a small but powerful portable compressor kit that is capable of inflating up to 33-inch tires by simply clamping the power leads to your battery, connecting the tire chuck to the valve stem and turning the unit on. Tire pressure can be monitored using the gauge mounted on top of the unit. VIAIR 90P portable compressors are shipped complete with an open-ended (free-flowing) air delivery hose, a pressure gauge, inflation tips and a deluxe carry bag for simple stowage and increased portability.