Heater Control Valve. We are an authorised distributor for NRF parts. Equivalent to Part Numbers: OE: 171819031D, 171819031C, 171819121 HELLA: 8F�. If you order before 12PM we'll dispatch same day from our UK warehouse. For guaranteed next day delivery please select this option at checkout. This product comes with free 365-day no quibble returns (UK only).