Orphan Barrel Muckety Muck 26 Year Old Single Grain Scotch WhiskyOrphan Barrel Muckety Muck 26 Year Old Single Grain Scotch Whisky Although Port Dundas Distillery closed its doors in 2010, there are select, rare remaining stocks that allow a glimpse into the glorious past of one of Scotlands most respected and historic distilleries. Muckety Muck is one of those rare single grain Scotches, now releasing the 26 year old following the smashing success of the 24 yr and 25 yr release.