Help with leaking MDPE compression to water meter housing

[NCXo82ike]

Hi,

Please help me figure out what I'm missing. I have a plastic stop tap with water meter housing (no meter yet) at my boundary to the street. Anglian water fitted this in 2020 when the old metal stop tap failed.

 

I dug this (reasonably carefully) during other works in my garden and it was seeping at the connection to the meter. I have taken off the connector and refitted a new length of MDPE pipe. Since then it is leaking significantly.  I reconnected it as follows:

 

Nut (original)

Clamp (the split plastic ring, original)

Thrust ring (original)

O-ring (taken off a new 25mm straight coupler)

Meter housing

 

There was no pipe insert in the MDPE previously connected. I didn't see any o ring but I was working in poor light and may have dropped it. 

 

Any ideas what I'm missing? This is a DIY job but I've done a few similar things in the past. 

I can't easily find compression fittings to match- would they all be the same inside?

Hoping I can find a solution that doesn't involve getting Anglian Water to replace the whole unit.

[JohnMo]

See no mention of the pipe inserts, so did you have/install?

 

A video of assembly easier than loads if words 

https://youtu.be/QDJ2gUNuf-Q?si=lF9exiA8-baO2cDL

Edited November 16 by JohnMo

[NCXo82ike]

1 minute ago, JohnMo said:

See no mention of the pipe inserts, so did you have/install?

 

A video of assembly easier than loads if words 

https://youtu.be/QDJ2gUNuf-Q?si=lF9exiA8-baO2cDL

thanks JohnMo, I did actually watch exactly that video last night. 

I installed a pipe insert- there wasn't one originally.

 

I presume that was a problem with the original install? Surely having the insert in couldn't be the issue?

[NCXo82ike]

So looking at it yesterday it seems like the thrust ring, at full thrust, doesn't make contact with the o ring I took from new mdpe coupler. The new o ring looks to be 3mm thick (calipers time in the daylight) so I'll try upsizing it. The only other option I can think of is there was some sort of spacer between the thrust and o ring, or an o ring with a weird oval section. 

 

Typical plumbers' merchants aren't familiar with the fitting- I have been recommended a 'civils' merchant who stock the Binary box itself

[Conor]

Pipe needs to be straight and not pulling, these things leak easily, I've installed 100s of them.

 

Strictly speaking, this is the property of the water company and you shouldnt be touching them, better option is to call them and say their meter box is leaking.