Here is a thread with some names of FR reps who work with Georgetown models. Possibly one of them can help you to narrow down the type for you or point you to someone else in that division. Good luck!
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Scott
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD
You should be able to tell what brand name of system should be a label on the pump or if it had jacks the panel that controls them should have it on there. Hope this helps.