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What is a Y-fitting and when do you need it?

pp-r fittings

You want to connect your washing machine and your dryer to the same outlet in order to avoid having to systematically empty the condensation tray of your dryer, for example. In this case, a simple condensate drain pipe is not sufficient. You also need a Y-fitting in order to connect 2 pipes to the same drain.

Tools for plumbing crimping

There are two types of crimping tools: hand tools and power tools. For a professional, it is obviously recommended to use power tools. Indeed, the electric crimping pliers (with battery or on mains socket) allow a speed and a standardization of the operation which guarantees a perfect crimping.

This machine comes with jaws and inserts of different types in order to adapt to the diameter of the tube to be connected and to the fittings. Three types of jaws exist.

The mother jaw with inserts

Very practical on a mother jaw, the inserts allow modification of the material or the diameter of the tube without having to change the entire jaw. One way to simplify work and save time!

It thus becomes very easy to work indifferently on steel, copper, multilayer or PER, and on any type of network. In terms of dimension, the inserts correspond to tubes ranging from 12mm up to 28mm for metal tubes and 32mm for multilayer.

# 2 The one-piece jaw

With this solution, there is a jaw for every diameter and crimp profile. It is easy to use because it does not require insert management. However, it represents an additional cost for the installer who will have to buy and store the different jaws to be able to ensure each diameter (from 12 to 63 mm) and crimping profile.

# 3 The adapter with chains

This solution is used for large tube diameters, over 40 mm. Note: solutions and diameters may vary depending on the supplier.

The 5 stages of crimping

Step 1: cut the tubes

In order to cut the tubes to the desired length and according to the material (multilayer, PER, metal, etc.), the installer can use a tube cutter, a fine-toothed saw or a power saw. Be careful, for metal tubes, be sure to cut the tube completely to prevent the risk of corrosion.

pp-r fittings

Step 2: prepare the tube

After being cut, the ends of the tubes should be carefully deburred or filed, inside and out, in order to remove unnecessary residue. This step is important and avoids damaging the O-ring when inserting the tube into the press fitting.

Deburring the inside of the tubes also prevents pitting and corrosion of the metal tubes. The deburring inside and outside can be performed with a manual deburring adapted to the material or to an electric deburrer tube..

Step 3: mark the tube

To achieve a reliable and quality crimp, the required insertion depth should be marked on the tube. This marking makes it possible to identify any intervention on the fitting before crimping. In order to identify any movement before or after crimping, it is preferable that the marking remains visible and is close to the fitting.

Step 4: assemble the fitting on the tube

To assemble, simply insert the tube into the fitting to the marked insertion depth, while turning it and pushing it slightly lengthwise.

In the case of a connection without a stopper, the tube must be pushed in at least to the marked insertion depth. 

Step 5: crimp the fitting

Before performing the crimping, the installer must check the absence of impurities on the jaws, the inserts and the crimping chains. The jaw must be in perfect working order. The use of jaws and crimping chains suitable for the pp-r fittings used is mandatory.

Remember to position the jaw correctly on the fitting to avoid mistakes. Once crimping has started, it must not be interrupted. To visually ensure the quality of the crimping, some suppliers offer solutions such as the installation of a witness ring which changes appearance after crimping.

pp-r fittings

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