Astral Pool Sand Filter Union Nut (00545-0302) valvekits and this Darlly cartridge is

and this Darlly cartridge is designed for compatible applications referencing FC-1256

A filter cartridge kit helps restore the core filtration element for a compatible spa or pool system

The Raypak 55A dial plate is designed for compatible heater control applications where the supported visual label or trim plate around the dial needs replacement

and PSD125-2000 references

this clear swing check valve helps restore dependable one-way water control and contributes to better overall plumbing-system performance

Astral Pool Sand Filter Union Nut (00545-0302) valvekits and this Darlly cartridge isThe Astral Pool sand filter union nut is designed for compatible plumbing connections where a serviceable filter union needs secure fastening. A union nut is useful because it helps clamp the removable union assembly together, supporting dependable retention while still allowing the connection to be opened later for service. This replacement is especially useful when the original nut is cracked, stripped, cross threaded, or missing. Using the proper