Sterling Electric SPH0302A001434 Inline Gearbox Speed Reduce 4:1 Ratio 460V 3PHNema frame size: 143TC Ratio: 4: 1 Input RPM: 1730 Output RPM: 434 Output shaft diameter: 3 4 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 properly vented and has proper oil