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Depending on the size of access needed (single stopcock, two with meter)
Build a brick chamber and top with>>
https://www.amazon.co.uk/dp/B018SMG500/ref=asc_df_B018SMG50055828914Or a drainage inspection chamber, but it would need some cutting, to get it around your pipe>>
https://www.plasticdrainage.co.uk/320mm-x-575mm-chamber-set-3-inlet-c-w-round-pp-cover.html
chambers avaliable in a few diameters and the risers are available in different lengths, plus they can be stacked and cut down for differing heights
Haven't heard of this.
Thankfully no asbestos. Getting the results is what has prompted me to action.
In more DIY Q&As (I'm on a roll)...
External stopcocks....
Without going into the details one of ours has been dug up around and I'm horrified to discover that ours (like our neighbours') is just filled in with a notion attempt to allow access with what is basically an old chimney stack.
I didn't take a photo of the hole, but this is what was over it. The internet didn't deliver any similar pictures as I guess people are too ashamed to post them.
Anyway. How would I go about making a neat job that's easily accessible with a hand?
In France they generally have a 50cm X 70cm concrete hole with the pipes neatly going in so you can reach them.
The area will ultimately be terraced over, so I'm happy with a steel cover or similar.
Our neighbour went for one of these which still seems like an odd solution. But all least his is deep. Ours isn't.
Even something like this would be an improvement on the ridiculousness of the current setup.
Even some decent search terms to put me on the right track would help. My first duckle mainly brought up gay outdoors porn.
Cheers!