Douglas 2 3/4hp - Original Style 1/8" BSP Petrol Tap and Filter Unit

Product no.: 0980 DG234_1185d

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This is the distinctive petrol tap and filter unit that were fitted to Douglas models from 1914 - 24.  The tap itself is a good quality brass taper tap with 1/8" BSP thread into the tank - as per the original item.  The filter unit is CNC machined stainless steel with screw in seperate filter and 1/4" BSP thread outlet.

Background and Manufacture:

The original Douglas 2 3/4hp petrol tap with filter unit (original Part Number 1185d) had a distinctive look and according to the original Spare Parts catalog was fitted to all models from 1914-24 (a plain tap without filter is listed for 1912-13, but I have also seen pictures of pre WW1 bikes with them fitted - not sure if these are original?).  

When rebuilding my own 1919 Douglas 2 3/4hp model, although I have a lovely original petrol tank (still in its original paint), I did not have the correct petrol tap, so looked to replicate this unit, using period photographs.

The starting point is an excellent quality brass lever tap, manufactured by one of my suppliers, which has the correct 1/8" BSP thread into the petrol tank and 1/4" BSP outlet, but no filter fitted.  It also has a gauze filter fitted, going into the fuel tank.

The only change made to these taps is to re-machine the lever boss to give them a more original look.

The filter unit is manufactured by ourselves, being a screw on filter cylinder, to accept a small conical gauze filter (fitted), then red fibre unit, and then a screw in bottom ferrule to secure the filter - the outlet of this being standard 1/4" BSP thread with taper.  This filter unit is CNC manufactured in stainless steel and is supplied fully assembled to the brass petrol tap, ready to fit. However, the filter unit can be stripped for cleaning if required.

If required, the small cone filter inside the filter unit can be omitted - as the main petrol tap unit also comes with gauze filter supplied.

Note: Dec 2020: As supplied to me, these fuel taps are manufactured in brass and unplated, I then polish before fitting the filter unit.  I am looking to have a batch of these taps bright nickel plated, to match the finish of the polished stainless filter unit (which has a similar look to the original nickel plated finish), at which point I will update this listing to show both versions.  However, having trial fitted a polished brass tap/stainless filter unit to my own project bike - I think they look very nice in this 'dual finish', and at this point that is how they will be supplied.  Please email at if you would like to reserve a plated tap version

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