Nope, my best advice, on my original post
The flattening of pipe is where there is a mains pressure leak, water everywhere, cannot turn it off, panic stations..... then you flatten the pipe.
If you are on top of it, have the time and the leak isn't destroying everything then it's time to investigate where it comes from, get it turned off, cut it back as far as is reasonably possible without costing you hundreds of pounds and then get a lead loc or plasson lead fitting and cap it off.
You haven't said if you are decommissioning this service or not?
Ultimately I'd be finding out where the supply comes from and get that turned off.
The flattening of pipe is where there is a mains pressure leak, water everywhere, cannot turn it off, panic stations..... then you flatten the pipe.
If you are on top of it, have the time and the leak isn't destroying everything then it's time to investigate where it comes from, get it turned off, cut it back as far as is reasonably possible without costing you hundreds of pounds and then get a lead loc or plasson lead fitting and cap it off.
You haven't said if you are decommissioning this service or not?