I bought a German mixer tap and has 15mm diam threaded end hexagonal nuts with O ring seals and want to fix existing UK 25mm copper pipe, what adapter do i need? http://i59.photobucket.com/albums/g293/greatchi/Imgp1266_zpsubo6pili.jpg http://i59.photobucket.com/albums/g293/greatchi/Imgp1263_zpsbc4dz...