Fernco manufacturers the most complete line of flexible couplings in the industry, from sizes of 3/4" to 27" (19mm to 381mm). Fernco Couplings have earned a reputation for consistent, superior performance, giving you full confidence in their quality and reliability. The dimensional flexibility of Fernco couplings ensures leak-proof pipe seals on virtually any pipe material. All flexible couplings are clearly marked with part number, size, and pipe material that the coupling will connect to.