I have to correct the previous poster Speed fit & poly fit are demountable these are WHITE in colour. Poly Plumb is a non demountable fitting and is GREY in colour. Push fit copper fittings Tectite Classic from yorkshire fittings is demountable (tool required) but Tectite Sprint is a use once fitting. No doubt there are other systems out there but as antony5378 said it depends on the make.
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