Nord SK92672AZDSH Right Angle Shaft Mount 1Hp Gearbox Speed Reduser Bevel 48.3:1Ratio: 48. 3: 1 Input RPM: 1650 Output RPM: 34 Output shaft diameter: 35mm hollow Vent included Output Torque: 01859 Lb In(in lbs) All gear reducers must have a breather vent. This allows for expansion and contraction of the air within the casing as a result of temperature changes. If a gearbox is used without a breather, oil leakage and seal failure may result. Gear boxes may or may not have oil or breather. Buyer is responsible to ensure gear box is