Datsun
Roadster Parts from Rallye Enterprises, Ltd.
This
part was used on emission controlled cars (USA) on
valve covers that did not have a separate crankcase
vent. It can also be used on covers where the original
crankcase vent has been damaged. You weld up the
damaged vent connection so it doesn't leak and use
this cap and stand in place of your old "flat
cap".