3P Technik Water Butts, Water Barrels and Water Tanks. Made in Germany from one of the leading rain water harvesting manufacturers in the world. A large selection of decorative water butts that include oak effect barrels, water tanks shaped like columns, water butts with built in planters and large water tanks. Capacity ranging from 210 to 4000 litres. Perfect for your Home Garden, Allotments, Schools, Holiday Parks, Leisure Centres and Business Parks.