Weepy check-valve gasket?

[scapco at ecentral.com]

Don in GJ wrote:

No, it's not sad, but it makes me a little...

Take a look at the attachment (hopefully it shows...). My 
Geeper has been weeping oil from around this critter for 
quite a while, and it's time to fix it (too many cracks 
from Harley friends about 'marking territory'). Figure I 
might as well do it along with the pre-season oil change. 

Anyway... is there something special that makes this more 
than a regular gasket? Only rated for a certian pressure? 
Something? The neutral switch sender that plugs in there 
seems to be functional, so I'm thinking the gasket is just 
aged. I'm sure it's still stock, so it wouldn't suprise me 
if it finally gave up the ghost. 

Any insight? Seems pretty piddly, but it's one of those 
little nagging things that irks. And If I need something 
special that I can't source elsewhere than Mama Kaw, I 
don't want to tear it apart without parts in hand. 

Don in GJ