Standard petrol tap, straight type with a filter and locknut. It is either on or off, there is no reserve position. This is fitted with the latest VITON seals, so it is suitable for use with all modern high ethanol fuels. 1/4 gas fittings both sides, which have a thread diameter of 1/2 inch. It is recommened to use a Dowty type washer with this tap to ensure a good seal (available seperately).