The Cosmos Twin Top Radiator Valve continues to enjoy immeasurable success since its launch in 1977. The Cosmos was the first radiator valve to be offered with both the wheelhead and lockshield tops; it is renowned for its superb reliability. In laboratory tests the spindle of the valve was opened and closed 2000 times without showing any signs of water leakage through the gland. Each valve is individually tested on custom-designed, automatic, multi-station assembly and pressure-testing equipment to ensure reliability and performance. Available in 8/10 or 15mm.