This is the rubber radiator fan switch seal for a MGB 1977 to 1980 to chassis # 511290, Triumph TR7 All years. Originally the fan switch has a very thin rubber skirt, which would split overtime and would not hold the seal. We have found a Jaguar seal which has the same inner and outer diameter but has a longer skirt for a better seal and longer life. Order a new seal today and keep your sender in your radiator where is belongs