Power Tech Duo Prop Propellers are direct OEM replacements for the Volvo Duo prop propellers. Using OEM equivalent geometries ensures equivalent performance and rpm parity with the original propellers. To ensure strength and long service life, we produce these propellers using a low pressure casting process and a high quality aluminum alloy. This combination provides a propeller with the capability of being easily welded/repaired, a capability traditional die cast alloys simply cannot match.