This valve has been obsolete for quite a while now so I don't think there is any thing for tech support and there is limited part availability for these as well.
www.lindenelevator.com might be able to help, but I highly recommend replacing it altogether. TKE makes a I2 conversion kit for some of these old P series valves, other wise replacing the whole pumping unit is probably the best option given how old the rest of the pumping unit probably is.
