In case the text is to be used by technicians or estimators, I would suggest:
'... e.g. high quality fitting of the joints to the existing piping.'

I realise that 'quality' is not the literal translation of 'precisie', but in practise this is what is meant if combined with fitting.

Furthermore, it is customary among technicians to use the word 'piping' if one refers to a (part of a) pipe network.

tapping into the water main and provision of valves to be installed at the water main and at the property line. City. staff will tap the main. ...
www.mkedcd.org/build/pdfs/watercon.pdf

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Note added at 41 mins (2005-10-12 08:54:35 GMT)
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i.e. tapping into the water main of the existing equipment

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Note added at 2 hrs 45 mins (2005-10-12 10:59:15 GMT)
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with great precision

it actually, though hazily, exists.
i wouldn't dream of using it myself.
it's a near perfect gloss on 'intakking'
which reverses the flow on 'vertakking' (bifurcation etc).

i'd use juncture; your real problem is getting the whole sentence.

high-precision joints with the existing pipes and cabling (if both water and electricity are meant, otherwise, e.g., pipelines.)