PEX water tubing (red and blue)

Plastic push fit has been available in the U.K. for many years. No specific tools needed except for a pipe cutter. It has advantages and disadvantages especially on exposed pipes which can be easily knocked i.e. under the sink. You simply cut the pipe to length, push the connector on and hand twist the top of the connector tight. You must ensure the connector is pushed fully home and really fully tightened or the crimp willl come off. Do not over bend the pipe as this adds pressure to the compression fitting. Sweeping bends are best. Not for use in high water pressure areas. For example, my water pressure is 10 meters per head. ( easy test: it will fill a gallon bottle in 30 seconds)  so the pipe, although it will take the pressure you must ensure plenty of pipe brackets to prevent the pipe moving when pressure is released or stopped. Here I will not use it on mains supply, but it is great for overhead tanked and hot water. Advantages are speed and any competent diy'er can use it. Disadvantages is if the compression fail you have a full on open pipe not just a trickling leak.  It is also compatible with copper pipe so you can tag off existing piping. Personally I prefer solder fixed copper joints a as is less troublesome in the long run.  It can also be used to replace a faulty piece of pipe if you run in with a nail or an old bend splits