Plumbers' merchants supply the materials and equipment used for plumbing, heating and water systems. Their stock commonly includes pipes and fittings in materials such as copper, plastic and steel, taps, valves, wastes, traps, pumps and water tanks. Many also carry sanitaryware, including toilets, basins, baths and shower components, as well as heating products such as radiators, boilers, controls and underfloor heating parts. Customers may include plumbing and heating contractors, builders, maintenance teams and householders undertaking repairs or renovations. Merchants typically offer product advice, help identify compatible parts and provide technical information from manufacturers. Many sell from trade counters and showrooms, take orders for collection or delivery, and can source items that are not held in stock.