Suitable for 10,15,22 and 28mm copper compression fittings. Maincor compression connections are the simple, easy way to connect multilayer pipe to copper compression fittings and a wide range of valves, radiator connections and threads with a straight BSP connector. They form a handy repair coupling. The last letter of the product code indicates the metal type (C, chrome & B, brass). The 12x10mm and the 16x15mm are available in chrome or brass.