The upper section of a twin-light window with an ogee head, the characteristic S-curved arch associated with late Gothic architecture, was set into the distillery wall to indicate the location of a holy well known as Tiobra Bhrianach.

Writing in 1946, O Coindealbháin recorded that the well drew visitors from the surrounding countryside, as holy wells across Ireland traditionally did, attracting those seeking cures, blessing, or simply maintaining a devotional habit that stretched back centuries before the industrial building rose above it. The distillery's response to this footfall was pragmatic rather than reverential: on one or two occasions, when the visits became what the record describes as troublesome, the well was simply closed up. That a piece of ecclesiastical stonework was nonetheless used as a marker suggests some acknowledgement, however grudging, that the site carried significance worth noting, even if the well itself was no longer accessible. The name Tiobra Bhrianach points to an Irish-language identity for the well, though the precise origin of that name is not recorded in surviving accounts.