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How to fit Plasson fittings

Found in more than 80 countries worldwide, Plasson fittings have revolutionised how polyethylene (PE) pipes are connected – for applications such as water supply, agriculture, irrigation, telecommunications and more.

The range of Plasson pipe fittings on the market today is vast. We are proud to stock an extensive range of them – including compression fittings like couplers, adaptors and end plugs and push-fit water pipe fittings – here at Total Pipes. We even supply water meter mounts, boxes and kits to suit all manner of water-based projects. So, whatever it is you’re looking for, you’re sure to find it within our online inventory.

All Plasson water fittings are WRAS (Water Regulations Advisory Scheme) approved and incredibly easy to install. The question is, do you know how to connect them?

Here we look at how to fit Plasson fittings – including a few of the different types – both quickly and correctly:

Imperial to Metric pipe fittings

Rule number one when connecting Plasson fittings is to take your time.

Start by slackening the nut until half of the thread is visible. Once you’ve done that, push and twist the Imperial pipe into the body – via the nut, red split ring and O-ring and, using a wrench, tighten the nut up until secure.


The method of connecting adaptors can vary significantly depending on the type. For example, fitting imperial adaptors is simple. All you need to do is:

  • remove the nut and get rid of the white split ring
  • mount the nut onto the pipe and assemble the red split ring
  • feed the barbed adaptor and plain end adaptor into the pipe

These Plasson fittings can be hand tightened.

Universal pipe adaptors, on the other hand, require more preparation. Before you do anything, you will need to remove any grease and roughen the outer surface using wire wool (or similar). The rest of the installation remains the same, only a wrench is required to firmly tighten these up.


Designed for barrier pipes, PlasShield fittings are sold in a range of dimensions, including 25mm, 27.4mm, 32mm, 34.5mm, 63mm and 65.8mm. When installed properly, the PlasShield offers exceptional resistance to chemical permeation. So, you must make sure that the pipe and fittings are compatible with each other.

Following this, cut the pipe square before removing the nut, ring and barbed adaptor from the body. Then mount the nut onto the pipe and assemble the grip ring – ensuring it sits flush with the end of the pipe. Push the barbed adaptor into the pipe until it reaches the stop, and the plain end adaptor into the body – past the sealing ring – to the stop. Once complete, tighten the nut with a Plasson wrench.


The process of connecting a pipe with Plass4 Plasson fittings is straightforward.

Using the Plasson Gauge, check you have the correct fittings by measuring the pipe. Cut and deburr the pipe, if required, and slide the fitting end onto the pipe, until it gets to the internal fins and a resistance point is felt. Taking extra care to not force it past the resistance point, tighten the nut against the body using a wrench.

Want to know more?

Here at Total Pipes, we have been supplying Plasson pipe fittings for many years, so it’s fair to say we know a thing or two about them.
If you’re unsure which fittings you need, or you’d like more detailed information on how to fit Plasson fittings, the team will gladly assist. Simply call 01254 382 000 or email us at, and we’ll be in touch.