Not sure of the deatil of the pump but I bought it from you guys some time last year.
Which seal are you talking about ? the beige one or the black diaprahm ..by the way it way only every used with 50/50 watermeth. It is the one is the center anyways ( u say 100% meth ?)
I clean it out with some q20 and relubed - closed it up and the pump spins now...
Just need to order some of the seals from you and I will use it as demo pump in the shop .. have to give customer a new unit