Bullauns are a recurring feature of early Irish ecclesiastical sites, their exact function debated but their presence almost always associated with healing, ritual, or the memory of a founding saint. What makes this one quietly remarkable is the folklore attached to it, recorded by local schoolchildren in the mid-twentieth century: strangers who visited the well and emptied the hollow stone would return a short time later to find it full again. No explanation was offered, and none seems to have been sought.

The well and its bullaun sit within an ecclesiastical enclosure associated with St Mobhi's monastery at Grange, roughly three miles west of Skerries in north County Dublin. The site clusters together a medieval church, a graveyard, and the holy well itself, which is enclosed beneath a horseshoe-shaped cairn of large boulders and approached by a flight of well-preserved stone steps descending eight or ten feet from the east. The well is sometimes referred to locally as St Mauvee's Well, a variant of the saint's name that appears in the Schools' Collection folklore gathered from Milverton School and now held in the Dúchas archive. A geophysical survey carried out by Nicholls in 2003 helped define the boundaries of the wider enclosure, confirming that what survives above ground is only part of a more extensive early Christian complex.

Access to the site is via a footpath from the gate lodge of Milverton Hall. The bullaun stone itself is inset into the wall of the well structure, about four feet above the water level, and the folklore collected from Milverton School describes it as resembling a holy water font. The mound of stones at the head of the well was thought to have once supported a statue, though none survives. The steps down to the well are described as well preserved, and the descent gives the place a distinctly enclosed, grotto-like atmosphere. It is a small site, easily overlooked from the road, and the medieval church ruin stands only about fifty yards away.