The original Speyside distillery was built in 1897 and a second distillery was built in 1972 alongside the original distillery. Both distilleries operated together until 1985, when the original distillery was shuttered. Glendullan (the Second) mainly provides its whisky for blends and is sold as a Single Malt under The Singleton brand (Singleton of Glendullan) - since 2007 exclusively in the US market. It is currently owned by Diageo.
A long fermentation of about 75 hours in a mix of stainless steel and wooden washbacks results in a lightly fruity and grassy distillate.