Just, that I have no connection with this company, my post is to only let you know that parts for these commercial pumps are still available. This website is more than us restoring old pumps, once in a while someone will come on requesting info on a one of these pumps.
My suggestion, copy my information, put it in a file, sooner or later someone will post a request as to where can he find parts for these meters.
Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.