Victorian Plumbing Lancaster Replacement Ceramic Tap Cartridge Pair of Valves 1/2" BSP (32 Teeth x 52mm Version) : Amazon.co.uk: DIY & Tools
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BSP 3/4" Pair of Bath Tap Cartridges Quarter Turn x 50mm x 20 teeth (Supplied with Solid Brass screws) (Pair (One of each)) : Amazon.co.uk: DIY & Tools