This Flojet pump was used to transfer radiator coolant a a friends repair shop. He retired and gave it to me to sell. I do not know when it was manufactured, but I expect it is at least 20 years old. He only worked on Corvettes and was meticulous with everything. I dusted it off and tested it with clean water which flushed out the coolant that was still in the vanes. It appears to be in excellent working order.