The cap appears to be original with some modifications made by previous  
owners over the years. It should not leak any water as it is below the water  
line of the R22. Is it currently leaking? If not, leave it alone.
 
Rummy
 
 
In a message dated 1/13/2013 4:37:29 P.M. Eastern Standard Time,  
steverayj at hotmail.com writes:

centerboardmine04.jpg