The hose clamp around the nipple prevents the expansion plug from splitting it.

At 13psi again, the leak is rapidly diminishing... Eventually, it stopped completely, but I found one more nearby in the tank seam.

GO TO THE NEXT PIC...

UPDATE: 6/5/15 (about 3 years later) this tank blew out farther down on the side, and I replaced it with a new one from 1800RADIATOR. I may open this old one up and fiddle with it.

Owner caption September 2012 · Photo 4717 of 5000