A Long Island landlord pleaded guilty yesterday in the 2007 carbon-monoxide poisoning deaths of three tenants, including a young mother and her 4-year-old daughter.

Wilson Milord faces up to four years in prison.

Prosecutors say Milord placed a gasoline-powered generator in a West Babylon home he owned, instead of providing an electrical hookup.

Tanisha Armstrong, her daughter, Talani Johnson, and a downstairs tenant were overcome by fumes from the generator and died in their sleep on Nov. 20, 2007.