Fuel Cap , Breather ??

[k8207418]

I’ve got a couple of of caps neither of which appears to fit with the fuel tank or engine 
Any ideas what I have ?

[Ivor Hawkins]

I think the top one is an oil filler cap which is missing its spring clip....the bottom one could be missing its clip too!

[Mike Costigan]

I think the bottom one is a Ruby petrol cap, which should have two small pins to secure it; it looks like your filler connection has been modified to take a different cap.

[k8207418]

There is a filter tube strainer fitted 
So the brass lugs at 120degrees isn’t standard ?

[A G Wood]

Agree with Ivor, the top one looks like an oil cap minus the critical clip which goes across the diameter and is retained by two rivets.
This is a Fourteen fuel cap, (minus the retention cable and cork washer) which I have been told is identical to the Seven version.
 Although Mike C mentions two pins...

[Graham Barker]

Attached photo is of fuel filler on 1937 Ruby. I can't see how your cap relates to this.

[A G Wood]

My informant was wrong, I guess.  I've never directly compared it to a Ruby one...

[Mike Costigan]

I stand corrected - three pins it is!

[Graham Barker]

Hi A G Wood, I meant that I can't see any relationship between my filler and the cap of k8207...  yours appears to be quite similar to mine. 
Cheers 
Graham

[Dave Mann]

Your first photo is an oil filler cap which has lost it's retaining clip, here's a photo of a complete on C/O
  Seven Workshop oil filler cap.jpg (Size: 57.92 KB / Downloads: 99) the Seven Workshop