JG Speedfit or Speedfit as it is often referred to was created by John Guest in 1974 for compressed air.  The push-fit technology was adapted for heating and plumbing in the 80s and has won numerous awards for product innovation and design.  They are specialist in producing various heating and plumbing components which include Speedfit fittings, designed to ensure a reliable, multi-seal, leak-proof joint, whilst enabling faster installations that can be installed and demounted without tools.