MODELS T-50TX, T-70TX, T-100TX, T-50TXR, T-70TXR, T-100TXR (USE KEYS 1 THRU 19)
MODELS 35TX, 50TX, 70TX, 100TX, 135TX, 35TXR, 50TXR, 70TXR, 100TXR, 135TXR (USE KEY #'S 1 THRU 19 EXCEPT AS LISTED IN KEYS 20 THRU 22)
FILTER CARTRIDGE DIA IS 8 11/16" FOR ALL MODELS