Genuine Denso - B / 3B Fuel Pump Primer.
Also suits other B Series Toyota Diesels, Including:
B / 2B / 11B / 13B / 3B
An Internal Seal in these can fail after 40+ Years and make it incredibly difficult to bleed your Fuel System after a Filter change.
If you want to keep the system Original, this is a perfect replacement.
This is made by Denso, and identical to the Genuine Toyota Part.
Includes Copper Washer.
The Original Toyota Part Number is 22501-77021.
Show in the Parts Diagram as "22501".