The parts fit most of the Rainbow RTL/RCF 17-2504, 17-2524 and the 17-2503 models used in hot tubs in Canada and the United States. These part do not fit the Rainbow RDC top load filter series.
The Rainbow RTL top load filter lid does not have the adjustable bromine/chlorine puck feeder tube built in them, the RCF model have the lid with the bromine/chlorine puck feeder build in which also has a dail on top to adjust the disovle rate of the puck in the feeder tube.
To find the correct part you need see the schematic on right for all the parts in a Rainbow RTL or RCF top load filter and match it to the part listing with the matching number.
Rainbow top load filters and all parts are made by Pentair.