Definitely the best hardware shop in Oxford.
Friendly, understanding staff offering loads of bits at reasonable prices.
I wish every shop was like Smith and Low.
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These brass valves are the most common types of ball valves found in British homes.
They are typically found in loft cisterns, such as the cold water storage cistern and the feed and expansion cistern.
As the cistern fills and the water level rises, the float pushes the float arm up. This in turn moves a rubber washer against the valve seat, closing the valve.