PEX-AL-PEX Compression Pipe Fitting Guide 101

In this blog post, you’ll read:The Pex-Al-Pex pipes or called PAP pipes. It uses in commercialized and household plumbing systems. Yet, It works in pressure assistance on compact gas and air systems. They are generally combined with metal fittings.
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What Is PEX-AL-PEX Compression Pipe Fitting?

The Pex-Al-Pex pipes or called PAP pipes. It uses in commercialized and household plumbing systems. Yet, It works in pressure assistance on compact gas and air systems. They are generally combined with metal fittings.

They gained their label for the sandwich-layered structure. It includes polyethylene plastic (PEX). For the external layer, aluminum (Al) is for the central layer. Yet the other layers of polyethylene plastic (PEX) for the inner layer.

PEX-AL-PEX Compression Pipe Fitting
PEX-AL-PEX Compression Pipe Fitting

How does PEX-AL-PEX Compression Pipe Fitting Work?

Compression fittings for PEX work likewise to compression fittings for plastic piping. It also works for copper or other plastic pipes. The installation includes a compression ring, a compression insert, and a compression nut.

Manufacturing the link involves putting the compression insert inside the tip of the PEX tubing. Gliding the compression ring over the tubing. After that, secure it with the compression nut. As it tightens up, the compression nut presses the ring. And the tubing against the insert, forming a complete seal.

Compression fittings are straightforward to put in place and disconnect. Constructing them is favored by DIY homeowners, contractors, and plumbers. They are more overpriced than crimp fittings. Compression fittings are well-fitting when you deal with many joining points. Or elsewhere, the disconnect is predicted.

Pex Al Pex Compression Fitting
Pex Al Pex Compression Fitting

Specifications and Dimensional Data

PEX-AL-PEX SIZEOutside DiameterInside DiameterVolume
1 inch1.260″1.032″4.35
½ “0.630″0.500″1.02

Main Features Of PEX-AL-PEX Compression Pipe Fitting

  •  Easy Joint Assembly

Pex-al-pex connections build with either compression fittings or crimp-on-connector rings. These connections are uncomplicated and furious to end. And there’s no need to join and torch them. Yet, excluding the times when you need to link new PAP lines to the existing copper source pipes.

  •  Immune to Frost Cracking

pex-al-pex tubing is better as compared to stiff piping. It is done when repelling the surface pressure of freezing water. Most manufacturers will inspect and permit their pipes. They suffer five freezes and melt cycles earlier than any splitting can occur.

  • Flexibility:

You can curve them using your hands in any way, and they will stay stable. It lets you effort around it. And through modern frame members, floor joists, and walls. PAP pipes can bend up to a 3-inch radius, deprived of any kinks. It minimizes the need for elbow connections.

Non-barrier Vs Barrier PEX Vs. Pex-Al-Pex

Determining whether to use Non-barrier PEX, Barrier PEX, or Pex-Al-Pex will base on what aim they use. And what other parts they’re successful in working. All are actually polyethylene cross-linked or PEX, but some have more characteristics.

Non-barrier PEX

Non-barrier PEX is a PEX with no oxygen obstacle. This type is used in clean water uses. Yet, the Barrier PEX is suitable for heating applications. It hasn’t been accepted yet for drinking water and sanitation.

When using non-barrier pex, you should be more alert. It ensures that each constituent in the system doesn’t hold iron. This type of tubing is seen severely in radiant heat applications.

Barrier PEX

The barrier here is the oxygen barrier, which is more coated in the tubing. That confirms that no oxygen will get into the heating system. It could be problematic once oxygen enters the system. The main constituents could start to corrosion.

The oxygen barrier allows cast iron essentials in the system in place of bronze and brass. It means that the constituents, such as pumps and flanges, are the least costly and can run for an extended time.

The barrier pex is the general selection for radiant heat systems. This tubing method is cheap when buying parts and will stop corrosion.

barrier pex
barrier pex


This kind of tubing can usually see in outdoor heating. Yet it is also used for high-temperature systems, such as baseboards and fan coils. But it also is used for warm board systems.

The acceptance of pex-al-pex pipes started in radiant heating systems. They are best for this use since the lines will maintain their forms. They are also used in:

  • · Cold and hot plumbing distribution, both residential and commercial
  • · Chilled water piping
  • · Outdoor ice and snow melting
  • · Hydronic piping and distribution
  • · Pitch heating/ turf conditioning

Tips for Making PEX Connections

Where likely, install PEX tubing to lessen the number of fittings required. Yet, this will diminish the possible leakage and troubles.

  • · Wherever conceivable, turn the tubing to change directions. Yet, somewhat than making right-angle bends with fittings.
  • · Use manifolds to feed several PEX lines from the only supply line.
  • · Reduce tubing lengths when designing your plan.
  • · Pick out the suitable PEX pipe diameter for use.
  • · Use PEX color coding. Warm and icy lines should be color-coded differently. The standard rehearsal uses blue for cold and red for warm water lines.
  • · Bundle pipe runs in conjunction to lessen the right time.
  • · Plan transition points for efficacy.
  • · Make sure joining points are reachable. This clarifies any future preservation that might be essential.

PEX-AL-PEX Advantages

  • · Security of clean water and long-term reliability.
  • · Resistance to rusting, tuberculation, deposits
  • · Plasticity combines with stiffness to hold its figure.
  • · Fewer linear lengthwise thermal expansion/contraction than standard PEX
  • · The aluminum surface keeps away oxygen from entering the pipe.
  • · No flame was used for the connection. Many fitting and joining opportunities.
  • · Thin, easy to transport, and compact.
Pex Manifold
Pex Manifold


The one structure I do not praise for PEX-AL-PEX is a home-run style manifold piping system. Yet, the PEX identify as the piping system for this manifold system. PEX-AL-PEX is not as elastic to provide accommodations for this type of fitting. PEX-AL-PEX plan for conventional straight-piping methods or inside the block.

Another fear is that PEX-AL-PEX has not managed housing sprinkler systems. Yet, that could change. Yet, mutual housing sprinkler systems have gained fame. The PEX-AL-PEX will need a list to stay modest with other piping systems.

PEX-AL-PEX Applications

  • · Outdoor ice and snow melting
  • · Hot and cold water plumbing distribution, both commercial and residential
  • · Chilled water piping
  • · Pitch heating/ turf conditioning
  • · Hydronic piping and distribution.

For more detail, click here.

How to Install Compression Fittings?

Compression fittings in the world of plumbing are very knowledgeable. They are a safe method to bind copper pipes lacking the use of heat, constructing them with DIY’ers.

Different types, like valves, utilities, and connectors, must contain compression fittings. Yet, in demand to make them water fitted and shielded.

Compression fittings work by compressing an ‘olive. The olive compresses between two tapered surfaces and the pipe itself. The two surfaces are the frame of the fitting (be it a connector, valve or any other type) and the nut. Yet, utilizing a spanner and a couple of grips, the nut stiffens. It puts pressure on the olive and bites it onto the pipe.

Compression fittings work fine if the pipe is non-contaminated and cut accurately. Pipe slices are the best tool for such a job and are excellent in fitted spaces.

When the pipe is cut and then washed, accumulate the compression fitting by gliding on the nut. The olive will be at both tips. Grip the compression body with a pair of grips and stiffen the nut with a spanner. It is said in the dealing to not over-tauten a compression fitting. Yet, leaving you more yarn in the case of a leak and not altering the olive or fitting. Generally, a nut will need one total turn after the hand grip.

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