Speedfit push-in fittings was pioneered by John Guest of the John Guest Group of Companies. John Guest is the world's leading manufacturer of high quality push-in fittings, pipe and plastic plumbing systems. PlumbNation offer a comprehensive range of over 3,000 products addressing virtually every tubing and pipe connection requirement imaginable. These Speedfit plumbing products are supplied to a wide variety of plumbing and heating industries.