Do-it-yourself assembly and installation of metal-plastic pipes: installation instructions and tools


The assem­bly and instal­la­tion of a met­al-poly­mer water sup­ply sys­tem is car­ried out with­out weld­ing and with a small set of afford­able and inex­pen­sive tools.

It is these fac­tors, as well as the good tech­ni­cal char­ac­ter­is­tics of the mate­r­i­al, that allow you to car­ry out the process of assem­bling and con­nect­ing the water sup­ply sys­tem with your own hands.

This is the case when sav­ings bring dou­ble div­i­dends: sav­ing mon­ey and expe­ri­ence that will nev­er be super­flu­ous.

Distinctive features of materials

Advan­tages of met­al-plas­tic prod­ucts:plastic products and fittings

  • long peri­od of use;
  • increased through­put in com­par­i­son with a met­al water pipe of the same diam­e­ter;
  • does not require spe­cial devices to cre­ate the desired bend­ing angle;
  • quick and easy instal­la­tion of the struc­ture;
  • low coef­fi­cient of ther­mal con­duc­tiv­i­ty;
  • good sound insu­la­tion;
  • do not rust;
  • resis­tant to the for­ma­tion of inter­nal deposits;
  • the sys­tem is assem­bled with a min­i­mum of waste;
  • com­pat­i­bil­i­ty with oth­er mate­ri­als;
  • anti­sta­t­ic;
  • high resis­tance to freez­ing;
  • the qual­i­ty of the trans­port­ed liq­uid does not change;
  • a prop­er­ly installed water sup­ply sys­tem (with access to the main nodes) is ele­men­tary in repair.


  • with numer­ous bends of one point, dam­age to the inner met­al lay­er is pos­si­ble;
  • with sud­den changes in tem­per­a­ture, leaks may occur at the joints, requir­ing tight­en­ing or com­plete replace­ment of the fit­tings;
  • direct sun­light is detri­men­tal to prod­ucts with a poly­mer coat­ing.

different diametersMet­al-plas­tic pipes are pro­duced with diam­e­ters from 16 mm to 63 mm. In the con­struc­tion of hous­ing, mate­ri­als are used, the diam­e­ter of which does not exceed 40 mm.

Opti­mum and cost-effec­tive options are diam­e­ters 16 and 20 mmbut they can only be used if your water sup­ply sys­tem has con­stant good pres­sure.

The small diam­e­ter of the prod­uct will cause tur­bu­lence in the water flow, and the through­put will decrease sev­er­al times. Con­sid­er this fact when choos­ing a mate­r­i­al.

Technical indicators

  • prod­uct diam­e­ter 16–63 mm;
  • thick­ness of the out­er poly­mer coat­ing 2 — 3 mm;
  • alu­minum lay­er thick­ness 0.19 — 0.3 mm;
  • the weight of a pipe with a diam­e­ter of 16 mm is 105 g, and with the largest diam­e­ter — 1224 g (the weight of a run­ning meter is indi­cat­ed);
  • +95°С – opti­mal oper­at­ing tem­per­a­ture;
  • with­stand short-term load up to +110°С;
  • freeze at low tem­per­a­ture;
  • min­i­mum bend­ing radius 80 — 125 mm with man­u­al method.

Tools required for plumbing installation


      • Span­ners: adjustable and carob. They are used for tight­en­ing nuts in com­pres­sion fit­tings.

cutting scissors

      • Scis­sors for cut­ting pipes. With­out their use, cut­ting the mate­r­i­al into the desired seg­ments with smooth edges is much more dif­fi­cult.


      • sand­ing paper nec­es­sary for clean­ing cuts from small rough­ness.


      • Cal­i­bra­tor. With its help, the slice is returned to the orig­i­nal round­ness lost dur­ing the cut­ting process.

Press tongs

      • Press tongs required for man­u­al crimp­ing of press fit­tings.

Building hair dryer

      • Build­ing hair dry­er used for heat­ing pipes before bend­ing.

Installation technology. Installation instructions

compression fittings

Compression fitting

installation of a compression fitting

  • The fit­ting is untwist­ed: mount­ing nuts are removed from the ends, seal­ing rings are removed from the fit­tings.
  • The pipe must be straight­ened and cut with scis­sors. It is not rec­om­mend­ed to use oth­er tools for cut­ting: the cut is uneven, the integri­ty of the pro­tec­tive lay­er of the mate­r­i­al may be vio­lat­ed.
  • Sec­tions must be care­ful­ly cleaned and cal­i­brat­ed. Poor­ly machined ends can dam­age the o‑rings and com­pro­mise the tight­ness of the con­nec­tion.
  • A union nut with a seal­ing ring is put on the pre­pared seg­ment. The fit­ting fit­ting is con­nect­ed to the pipe and fixed with a nut: first by hand, and then with a wrench.

Con­trol com­pres­sion! When you hear the char­ac­ter­is­tic crack­ling of the met­al, stop the process. It is impor­tant to keep a bal­ance: a poor­ly tight­ened fit­ting will not be able to ensure the tight­ness of the sys­tem, and an over­tight­ened one can be imme­di­ate­ly thrown away.

To learn more about how instal­la­tion is car­ried out using thread­ed (col­let) fit­tings, see the video:

Fitting press


  • As in the first case, the pipe is pre-pre­pared: cut, cleaned and cal­i­brat­ed. Pay atten­tion to the end: its cut must be per­pen­dic­u­lar to the cen­tral axis of the con­duit.


  • Hav­ing removed the sleeve, we check the rings and gas­kets, and then we assem­ble the fit­ting. This is done in order to exclude the pos­si­bil­i­ty of instal­la­tion of defec­tive ele­ments.


  • A piece of pipe is pushed onto the fit­ting of the press fit­ting. The land­ing depth is con­trolled visu­al­ly (through a spe­cial hole on the sleeve).

Press fitting installation

  • From the oppo­site end of the fit­ting, the noz­zle process is car­ried out in the same way.


  • With press pli­ers we press the con­nect­ing sleeve inside the fit­ting.

The instal­la­tion process will be faster and more suc­cess­ful if you buy fit­tings and pipes from the same man­u­fac­tur­er.

push fitting

installation and assembly of a push-fitting

  • Con­nec­tion does not require addi­tion­al tools and fix­tures.
  • It is nec­es­sary to check whether the block is tight­ened to the stop.
  • A piece of pipe pre­pared in advance is sim­ply insert­ed into the open­ing of the fit­ting.

To reuse the push fit­ting, it is nec­es­sary to dis­as­sem­ble the struc­ture. To do this, unscrew the retain­ing block and remove the pipe. The belleville spring must be replaced with a new one — now the fit­ting is ready for use again.

clips for wall mounting

Mount­ing to the walls of the assem­bled sec­tions is car­ried out using spe­cial clips or brack­ets, which must be select­ed tak­ing into account the diam­e­ter of the prod­uct.

How to bend plastic pipes

You can bend the met­al-poly­mer pipe man­u­al­ly. In this case, there are small sub­tleties that are worth know­ing: the bend­ing process must be car­ried out grad­u­al­ly (in sev­er­al stages) and with the help of a build­ing hair dry­er.

It is nec­es­sary to heat the pipe with a hair dry­er. Grab your hands so that your thumbs are along the pipe and serve as a kind of empha­sis. Slow­ly and grad­u­al­ly we begin the process of bend­ing in sev­er­al approach­es, if nec­es­sary, heat­ing the prod­uct with a hairdry­er.

Do not make sud­den move­ments! It is impor­tant to main­tain the integri­ty of the inner lay­er and not deform the out­er one. At the moment of fold­ing, do not for­get about the per­mis­si­ble bend­ing radius, which is indi­cat­ed in the “Tech­ni­cal data” sec­tion. To prac­tice skills, use small cuts.

You can watch the video on how to bend met­al-plas­tic pipes cor­rect­ly:

Prices for materials and services

Aver­age ser­vices for lay­ing a met­al-plas­tic water pipe will cost you at least 30 dol­lars (exclud­ing the cost of mate­ri­als). The price will vary depend­ing on the com­plex­i­ty and scope of work.

One lin­ear meter of a met­al-poly­mer pipe (16 mm) costs an aver­age of 75 rubles, with a diam­e­ter of 26 mm — 185 rubles. The price range of fit­tings is from 109 to 3 dol­lars.

The instal­la­tion meth­ods described above will be per­formed by a man who has min­i­mal skills. Mea­sure your strengths and capa­bil­i­ties. And know that the end result depends only on your desire and effort!

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