Kohler 20RESD 20 kW Generator Single Phase, Natural GasLPG Kohler 20 Kw Generator Spec Sheet. 4.5/5 (6,764) Kohler 20RESD 20 kW Generator Single Phase, Natural GasLPG 4.5/5 (6,764) 4.5/5 (6,764) 4.5/5 (6,764)