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WRAS Approved Introducing the Copper Insert Liner - 20mm, a convenient solution for connecting copper pipes to compression fittings effortlessly These copper pipe inserts make compression joint installation hassle-free and require no specialised tools Crafted from copper, they ensure a tight seal without crushing the copper pipe, guaranteeing an oil-proof connection Simply press one of these inserts into the open end of the copper pipe before connecting to prevent deformation during compression fitting tightening