This single Evolve double packing gland 15mm angled wheel head drain off radiator valve complete with lockshield cap is a professional high grade valve, offering a stronger internal body and supplied complete with a PTFE tail. The valve body, tail piece and union nut are made of chrome-plated brass, the valve insert is made of brass with EPDM seats, while the wheel handle and lockshield cap are made of ABS. The drain off valve allows for the radiator water to be drained out when necessary.