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Browse our wide selection of metric and imperial pipe and fittings from 16mm to 400mm & 3/8” to 10”!

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Technical Information

PVC Pipe Technical Information


We are PVC Pipe System Experts 

At eeziflo-fittings we offer a full range of PVC Pipes, Fittings, Valves and Accessories in both Imperial and Metric sizes.

PVC-u, or polyvinyl chloride unplasticised, also known as, PVCu, uPVC, u-PVC, is a lightweight pipe material which offers an easy installation with an up to 50 year service life when used under correct conditions.

Figures found within the technical section of the website are quoted at 20°C unless otherwise stated.


WRAS Approved

eeziflo-fittings PVC products have a temperature range of 5°C to 60°C and are sturdy and durable. All products across our PVC product range have good resistance to abrasion, chemical attack and corrosion.

The majority of our products carry WRAS approval and are manufactured in accordance with the following standards: 


Imperial PVC-u products:

Pipe: EN1452-2

Fittings: EN1452-2

Threaded Fittings: BS21, DIN2999, ISO7.


Metric PVC-u products:

Pipe: EN1452-2

Fittings: EN1452-2

Threaded Fittings: BS21, DIN2999, ISO7.

WRAS Approved for Material Logo

WRAS approval is the easiest way to demonstrate product compliance and is granted by representatives of the water industry, and accepted by all UK water suppliers.

WRAS approval (for material) demonstrates that the material itself does not contaminate the water and therefore satisfies this particular requirement of regulations and byelaws.

Unless otherwise stated, all of our Imperial pressure fittings have the following pressure ratings:

Solvent weld - ⅜” to 8” = Class E/15 Bar

Threaded = Class D/12 Bar


Imperial / Metric Size Comparison

The most commonly used pipework sizing system in the UK has been the Imperial (inch) for many generations.

With imperial, sizes are designated by the nominal bore (nb) of the pipe. The introduction of the metric sizing system was to bring the UK into line with the rest of Europe, and whilst accepted in many areas of industry, has had a slower uptake, resulting in both Imperial and Metric remaining readily available in the UK. However, this has proved confusing, as Metric is sized in millimetres and relates to the outside diameter (od) of the pipe, opposed to imperial, which is sized in inches and relates to the nominal bore(nb) (or inside diameter (id)).

As pipe sizes from the different groups cannot be mixed, a special conversion fitting must be used to change from one to another if necessary.

For example a, 1½” (nb) imperial pipe is the equivalent of a 50mm (od) metric pipe size. Similarly, a 2” (nb) tube has a 60.3mm od and is also known as 50mm nb, but the metric equivalent is actually 63mm od.

Please see the Comparison Table for the full Imperial / Metric conversions from ¼” to 10”nb and 8mm to 280mm od.


  Metric vs Imperial Pipe Size Comparison


PVC-u Pipe Class / Pressure rating and Wall Thicknesses Imperial




PVC-u Pipe Class / Pressure rating and Wall Thicknesses Metric

PN6 PVC pipePN10 PVC Pipe

 PN16 PVC Pipe


PVC Assembly & Jointing Procedures

Fittings of rigid PVC can be glued to each other and on pipes of the same material provided the sizes and tolerances are in accordance with the standardisation and tolerances given.

PVC cement is gap filling. PVC cement softens the inside of the fitting and the outside of the pipe for form a joint chemically. The strength of the joint is reduced if surfaces are not properly cleaned or prepared.

Newly glued parts should NOT be submitted to mechanical stresses.


Step by Step Instructions

PVC Pipe Gluing Instructions



  • Ensure all jointing areas are well ventilated.
  • Do not allow a naked flame or smoking in the jointing area.
  • Cement must be used prior to its expiry date (shown on bottom of tin).
  • Always wear rubber or latex gloves when applying MEK cleaner and PVC cement.
  • Never dilute PVC cement.
  • Always replace lids on tins when not in use.
  • Always use clean brushes.
  • Always use lint-free cloth or absorbent paper.
  • If jointing outside, use a shelter to keep jointing surfaces dry in wet weather.


Installing Threaded Fittings

When installing threaded fittings you should follow these basic steps:


  1. Ensure all threads are clean.
  2. Apply PTFE tape to the male thread for 1 ½ turns in a clockwise direction.
  3. Screw the female threaded fitting by hand onto the male thread.
  4. It should be possible to screw the fitting on by hand for ⅔ of the thread length.
  5. After tightening by hand, add an extra ½ turn with a suitable tool, i.e. a strap wrench.



  • Use PTFE tape ONLY.
  • DO NOT use thread seal paste or any other jointing compound.
  • DO NOT force tightening of the joint under any circumstances.


For connecting plastic pipework systems to metal pipework systems, composite unions and/or flanges must be used, and can be purchased from our online store.



PVC Cement Setting Time Scales

          Cement Setting Time scales


PVC Cement Usage Recommendations

Cement Usage Recommendations


PVC Pipe Pressure Ratings

Pressure ratings for plastic pipework systems are always quoted at 20°C. It is a fundamental principle of such systems that if the temperature is increased, then the pressure rating must be reduced.

Irrespective of the pressure rating of the pipe, the corresponding fittings are generally manufactured to the highest pressure rating, which means that the same fittings of any particular size can be used in conjunction with all the pressure classes of pipe.


The following chart gives a rough guide as to the pressure/temperature relationship of PVC-u pipework systems.

    Pipe Pressure temperature relationship graph


Pipework Support/Spacing

In above ground installations, it is essential to provide support to ensure that the weight of the pipe and its contents are adequately supported.

The recommended maximum support spacing for horizontal runs of PVC pipe are given in the table below.

Spacings are calculated assuming the pipes are carrying water.

       Pipework Support Spacing


Need Assistance?

At eeziflo-fittings, our expert team has over 175 years of experience collectively within the plastic pipe industry. This vast amount of knowledge allows us to share our specialist expertise with all of our customers.

If you require any technical help or further assistance, or you simply have a question that hasn’t been answered within this page, then please do not hesitate to contact a member of our team on: 0113 235 9970 at any time Monday-Friday between 8.30am to 5pm, or via email: sales@eeziflo-fittings.com


However, our online store is available 24 hours a day, 7 days a week, for our customers to be able to place orders at their convenience - SHOP NOW!