Kuterlite Stopcock valves are manufactured from GM or DZR materials - A range of non-manipulative (Type A) copper alloy compression ends for jointing plain and chrome plated copper tube to BS EN 1057; up to 28mm with Tectite PEX / PEX pipe to BS 7291 part 3; PB Pipe [with liner] to BS 7291 part 2; XPress Carbon System tube / Carbon steel tube to EN10305-2 and Tectite 316 System tube or Stainless Steel to EN 10312. Kuterlite stop valves are designed wherever the flow of hot or cold water services need to be controlled or regulated. Kuterlite valves are guaranteed for 5 years against manufacturing defects and are WAS approved. Available in sizes from 15 to 54mm. Gunmetal stop valve (BS1010). copper x copper. Body and all parts in contact with water are made from gunmetal.