Rainbow/Pentair RTL-25, model R172512 is a 1-1/2"fpt top load filter. For use on portable spas, it is designed to mount in a niche so that the main body is under the shell of the spa, while the top...
Rainbow/Pentair RTL-25, model R172502J is a 2"s top load filter. For use on portable spas, it is designed to mount in a niche so that the main body is under the shell of the spa, while the top is...