Well, I know my cylinder measures 12.5 x 26, but just for the sake of the conversation here, I only see one pumping piston housing. Or at least what looks to me like only one.
Can anyone give me the breakdown on the serial number?

IMG_20200616_164200670.jpg IMG_20200616_164241998.jpg

Steve Coppens
Always interested in Sunoco items!
Really want a Sunoco National pump ad glass!!