You are purchasing one European-made reproduction nickel fuel primer cap or "syringe" for 1916-1924 Harley Davidson JD, F, singles, and Model W Sport Twin.  Fits as a perfect replacement for your OEM cap.  Also includes the leather gasket.  We can also put together a complete cap set with nickel plated plain caps as well.  We also sell the hand pump, hand pump valve body, fuel lines, oil lines, oiler covers, etc. for JD & early flathead models.  

If you can't find what you are looking for here or cimarroncycleworks, just email and ask.

Located at and ships from Cimarron Cycle Works in beautiful Cimarron, New Mexico, USA!

Machining and plating is identical to original OEM parts.  It really pulls a suction, so it can be used for its intended purpose.

I believe these were used on the following models, please cross-check your own reference material to make sure this is right for you: