- https://www.amazon.com/Intex-Small-Cover-Ring-Model/dp/B003K252T4

  Intex Small Top Cover O-Ring Model 10325

Works on these pumps:
Intex 56637 (Krystal Klear Model 637)
Intex 56635 (Krystal Klear Model 635)
Intex 58631 (Krystal Klear Model 12 and 12R)
Intex 58603 (Krystal Klear Model 02 and 603)