MODEL TM-12-L USED ON THE RANGER FILTERUSED ON THE RANGER MODELS RS-1615, RS-2015, & RS-2415 VALVE FLANGE DIAMETER IS 8 1/4"NOTE - SPIDER GASKET, OUTSIDE DIA 5 3/16"INSIDE DIA 3/4". THIS VALVE IS ALSO USED ON THE SPECK AQUASWIM FILTER AS-250