Built during the early 17th century, it was part of a system designed to take clean drinking water from the springs at North Hinksey to the Carfax Conduit, an extravagantly decorated fountain in the centre of Oxford. Resembling a miniature fortress, the conduit house covered and protected a 20,000-gallon lead cistern which continued to supply water to the city until 1868. On the walls are some beautifully chiseled graffiti dating from the 17th to 19th centuries.

• Disabled access: Uneven grass surface and gateways