Has anybody used these adaptors as I need to use some to rig up a test kit for my UFH and they do not sell the inserts separately?I only need two but have 10 pipes to test and have not connected the manifold yet as not sure of final height position so would like to test the pipes now. When I have looked at them I think you would be able to re-use them instead of having to buy quite a few as the 16mm end that goes onto the UFH pipe has a bit that inserts in the pipe with a split olive on the outside and then the securing nut.TIA