What's the inside & outside diameter of the 12 valve copper injector sealing washer?

 

don't know what the deminsions are but just buy some from haisley they're only .50 each

 

ID and OD must be correct but what's more important is the thickness. The thickness varies with the type of injector you use and makes a big difference in performance. Best bet is to get them from the injector supplier.

 

To the best of my knowledge and this is limited due to brain fade.

The outside and thicnkess I don't know but they uses 7mm and 9mm holes.