This is an industry-standard plumbing connection system for 1/2" (12mm) "Speedfit" pipe to be connected to "Speedfit" Twist & Lock fittings. The system allows you to connect pressure hot (80°C) and cold water plumbing throughout your RV, caravan or boat on your own, without help with almost zero likelihood of hose bursts. The hose comes in 2 colours, there are a huge number of standard (BSP, etc) type fittings to enable you to connect to sink faucets, hot water systems, toilet cisterns, indeed any potable plumbing at all. If you need to connect up almost any plumbing application, this is the one for you. Shown below are the various fittings that connect to the Speedpex plastic pipe via Twist & Lock fittings. To do the job, you will need fittings, pipe, pipe inserts clips and spacers, and a pipecutter. (You may not need all of this.) Most of the time, the hose simply pushes into the fitting. There are some fittings which are 'barb' type or 'stem' type. These connections are generally secured with a hose clamp. You will see 'stem' or 'barb' in the description to denote this. The tubing (Red or Blue) is made from Linear Low Density Polyethylene (LLDPE) and is foodgrade. You can even run compressed air, CO2 or nitrogen through it. It will take up to 150 PSI (10 Bar) at 20°C. Trust us, unless you are a plumber, this is the best and most efficient way to tackle that otherwise daunting plumbing job!