Jandy Check Valve rusted spring

Does anyone know of a replacement spring that can be purchased for Jandy Check Valve. "thanks for your input"

I don't think the spring alone is available. Here's the assembly that fits most current Jandy check valves:

Zodiac 7056 Cover with Flapper Assembly Replacement Kit

However, if the spring truly did rust . . . you need to figure out why. Something is wrong, since that's a stainless spring!