No lever, if it is truly a high flow machine there will be 5 coupler tips on the unit. Two of them will be std size, two of them will be very large and the last will be a small coupler used as a case drain that many high flow att require. If the machine only has two of the std sized couplers it is not a high flow unit. std flow rate 21 gpm, high flow 33 gpm, the intended att must also have a high flow rated motor to utilize the higher rate.