These replacement powder flask spouts will fit most of the smaller powder flask models Taylor's stocks. They are threaded M8x0.75 and made of brass.
Two Way Powder Flask by Twigg. very early & rare. SN 8981 – West
Black Powder Measures & Flasks - Shop Now
Muzzle-loaders Brass Powder Flask Nozzle - 30 Grain
Flasks, Horns & Spouts
The ™ Brass Powder Flask makes loading your muzzleloader easy and consistent. The convenient all-brass funnel holds a consistent 30
Muzzle-Loaders Brass Powder Flask - 1350 Grain Capacity - MZ1400
11 Piece Powder Flask Spout Set, brass, 10-1mm thread to fit most
French powder flasks
Black Powder Measures & Flasks - Shop Now
Black Powder Flask Spout
Muzzle-loaders Brass Powder Flask Nozzle - 30 Grain
Common thread dimensions
9 Grain Powder Flask Spout (M8X0.75 Thread)