Pentair SD70/Cristal-Flo II 24" Filter Standpipe Assembly (152000) o-rings and this H-Series 135K Union

and this H-Series 135K Union Kit is a useful Hayward replacement for that purpose

Replacement leader hose for compatible Polaris/Zodiac cleaner models

and this Polaris and Zodiac vinyl version is a light blue head using the 3-9-570 reference

They tend to create broad instability rather than one obvious fault

Supports smoother heater operation

Pentair SD70/Cristal-Flo II 24" Filter Standpipe Assembly (152000) o-rings and this H-Series 135K UnionThis 24" standpipe assembly supports the internal flow path on compatible SD70 and Cristal Flo II sand filters. The standpipe works with the lateral system to collect filtered water and direct it back through the filter outlet, making it a critical component during media replacement or internal filter repair. Use this assembly when the original standpipe is cracked, warped, shortened, or damaged during sand removal. A correct replacement helps prevent