Pentair EC90 Filter Element Retro Kit YGroup_3m-depth-markers with 21 inch filter tanks

with 21 inch filter tanks

and Sta-Rite/Swimquip 35505042

At a normal pressure level the valve should close again

This plastic depth marker tile states 4 IN

90 inch diameter pool rails

Pentair EC90 Filter Element Retro Kit YGroup_3m-depth-markers with 21 inch filter tanksThis is a Pentair replacement Element Retro Kit for Easyclean EC90 D. E Filter Systems. This kit is required when replacing filters on models manufactured prior to 2014. This kit includes 178616 Compression Spring, 190106 Air Bleeder, 178626 EC Center Core Top, U37 3 8P EC90 Air Bleeder Tube, 178656 EC90 Cartridge Element, 178627 EC Center Core Bottom, and 071422 Center Core O Ring.