WT Knowles Drainage

WT Knowles Drainage is the drainage-products site for W T Knowles & Sons Ltd, a family-owned manufacturer based at Ash Grove Sanitary Pipe Works in Halifax. The business has manufactured and supplied clay drainage products from its West Yorkshire factory for more than 100 years.

Its range includes clay drainage pipes, channels, channel fittings, gullies, drainage accessories and traditional salt-glazed clay products. The company supplies products through national and independent builders merchants, specialist roofing suppliers and merchant buying groups, serving sectors including housing, land and field drainage, agriculture, construction, civil engineering, roads, pathways, parks and sports facilities drainage.