"Use a flex coupling to direct-mount your engine to pump. Oil-resistant synthetic rubber inserts are used between the coupling halves to provide an equalized cushioned drive. When ordering, get one side to fit the motor and the other side to fit the pump shaft dia. Order two halves plus insert for complete coupling. When mounting, do not pound on the end of your pump shaft. Fits Models LO99, L100, L110, Max. RPM 3,600, Keyway in. 3/16 x 3/32, Outside Diameter in. 2 1/2, Max. HP 23, Shaft Diameter in. LO99 HUB 5/8. Made for 2 bolt brackets"
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