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This item is an amended (lipped) type of bottom main jet holder, to fit early Amac carburettors - i.e. the HYK type, as fitted to Douglas 2 3/4hp Models (as listed 1919 -21 as part number 1644D).  The original Amac type main jet nut relied on a very narrow chamfer to create its seal, when screwing it in to secure the float chamber - and certainly on the original nuts I have, seem very susceptable to leaking.  This design has added a lipped flange and red fibre washer - which seats to the machined face of Amac floatchambers to prevent leakage.  See detail listing for more information.  Price is for (nickel plated) jet nut and 2 red fibre washers