This is an antique and original Parker Vacumatic Oversize fountain pen filler system part made in aluminum. It has lock down mechanism in working conditions and as you can see in the picture, it needs the sac to be used. This is an used pen part and is in very good conditions. It was made in USA. 

THIS IS BEING SOLD As Is. THIS MEANS THAT THE ITEM IS BEING SOLD AS WE PURCHASED IT. WE HAVE NOT MODIFY IT IN ANY WAY NOR RESTORED IT. WHEN WE FIND PIECES LIKE THIS WE LIKE TO PRESERVE THEM THE WAY THEY ARE SO WE ARE SELLING IT IN THE SAME EXACT CONDITIONS AS WE FOUND IT. 

PLEASE DO NOT HESITATE ASKING US IF YOU HAVE ANY QUESTIONS.
WE COMBINE SHIPMENTS UPON REQUEST. 
IF YOU HAVE ANY ISSUES REGARDING THIS TRANSACTION WE ARE WILLING TO SOLVE ANY PROBLEM WITH OUR CUSTOMERS. PLEASE CONTACT US BEFORE LEAVING NEGATIVE FEEDBACK.