Vacuum take-off for a Dellorto DRLA carburetor.
This vacuum union uses o-ring # 7571 which you can order along with this take-off by selecting it in the drop-box.
This product is priced, and sold, as a single unit.
Required quantity per carburetor: depends on your set-up
This is item number 71 in the drawing of the Dellorto DRLA carburetor.
This is Dellorto Part Number: 10138