Evening, Duane, Now that I can see how the inside setup is made, I, too, think this very probably IS an original prototype MSR pump. Obviously, it was not introduced into production, as the white pump that we all have, is very, very different than this pump, most especially inside!! Thanks for clearing away the clouds of understanding, by showing us the interior design!! Well done, and hearty congratulations, Sir!! Take care, and God Bless! Every Good Wish, Doc
Thank you both Sam and Doc. To me, this was a collectors dream catch. I still need the production model. Just picked up a working all yellow pump over the weekend. Surprisingly, it must have been rebuilt as the O-rings were all in great shape. I only replaced the plastic tubing in the end. Duane
