Vacuum secondary or double pumper?
I've got a vacuum sec 750 (3310-3) that was rebuilt many moons ago then set on the shelf.
I'd consider it a good core and nothing more. I may have the makings of a gasket set somewhere, I'll have to scrounge around if you're interested. I can take pics and email, just send me your e-address in a PM.
$75.00
Cheers, Mark (Huntington Beach)