Joining 20mm Black Alkathene Pipe underground

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I've a feed from the mains to my garage in 20mm black alkathene pipe that feeds my garage.

I've managed to dig through the pipe and need to reconnect, but what fittings are suitable for this application.
 
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You have cut through the Alky branch pipe by accident, and now you want to repair the damage - have i got it right?
 
That is correct, it wasn't very deep nor where I was expecting it to be coming from to be honest.

Ideally I want to bury it again.
 
1/2" black alkathene class C and D is 21.5mm OD. 3/4" class C 19.5mm ID which do you have
 
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Have you exposed the 1/2" alky back to its Tee connection with the main water service? If so, you could replace with a single length of 1/2".

If its not totally exposed or accessible then cut the pipe and use a new length from the repair location to wherever you want - that way there's only one repair fitting below ground.

Take an off-cut of the 1/2" to the plumbing suppliers and tell them your story. You will need a straight coupler.
 

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