I purchased a Clear Vision visible model 517 last week in Russel, Kansas (home of Bob Dole).
Unlike any other visible pump I have, this one appeared to have a nozzle fork that actuated the drain back valve when the nozzle was replaced on the nozzle hanger. I believe the only part I am missing is the fork itself. I can probably weld one up using some flat iron but I thought I would check to see if anybody makes a repro or somebody has one. See pictures below. Thanks.
[This message has been edited by Tim Rohr (edited 12-05-2003).]