If you started a major overhaul in his apartment, change the heating or change the old corroded pipes with new pipes of metal-base laminate, which can be assembled and installed quickly and easily, then you definitely need a device, called PEX tubing crimp fitting.
Metal fittings can still fairly easily assemble a system of any complexity, as the fitting is connecting part of the pipeline. PEX fittings installed in the joints, branches, using the transition to a different diameter pipes. Also, if there is a need for frequent assembly and disassembly of pipes, fitting can not do without. Pipes of metal-base laminate, compared with, say, polypropylene pipes, shall not be welded. Installation of pipes from metal-base laminate is only possible through the use of fittings, which in turn can be divided into metal-compression fittings and fittings.
Fittings, depending on what they are intended can be classified as the elbows, tees, crosses, couplings. There are direct fittings, which are designed to connect the ends of pipes of the same diameter, transition fittings are required in the event that you want to connect the ends of pipes of different diameters. It should be noted, however, that such metal-brass fittings like elbows, tees, couplings, are much more expensive for pipes of metal-base laminate, than the same fittings that are used for installation of pipes made of polypropylene. To avoid such a situation, experts advise use of metal-base laminate tube diameter up to 32mm.
Fittings can be used not only during installation of new pipes, but also in the repair of pipes from propylene. I would like to note once again that the advantage of fitting metal-base laminate is that they do not require the use of welding equipment. The popularity of the use of fittings with increasing day by day, as the use of fittings is simplicity, reuse, and most importantly, greater resistance to corrosion. Scope fittings rather broad. They can be used when installing pipes for hot and cold water, the installation of sewer pipes, wiring for central heating systems.
