Fynnon y Winch (Pump House)

Fynnon y Winch is a pump house with an octagonal plan, featuring a partially collapsed hipped roof. The building is constructed from roughly coursed masonry with quoins and has a slate-covered roof. It has a low plinth course and yellow brick dressings around the door and window openings. The north-facing entrance has a planked door and shutters, with the door frame featuring a segmentally arched head and a partially collapsed door. There is a raised threshold with a recess below that has been blocked with brick. The pump house has windows on the south, east, and west sides, all with segmental heads and stone sills, although the head of the east window has collapsed.

Inside, there is a central stone well with a circular shaft. The iron winding mechanism, which is gear-driven, is preserved above the shaft. Two large timbers cross the shaft approximately 1 meter below the floor level. Timber planking spans the top of the shaft, supported by beams that also support the winding mechanism. This mechanism includes a horizontal iron wheel with cogs on the underside that connect to a small vertical gear wheel, which operates vertical bars that raise water from the shaft. An outlet pipe is located on the south side of the shaft near the top. The bearing on top of the horizontal wheel is attached to an open-topped shaft angled horizontally, where a horse would have been harnessed. The roof structure comprises rafters at each angle and midway between the angles, with horizontal struts meeting beneath the apex of the roof, covered by a metal plate. The windows feature wide splayed reveals and timber lintels.