- Works on these pumps
- 56637 (Krystal Klear Model 637–older smaller version)
- 56635 (Krystal Klear Model 635)
- 58631 (Krystal Klear Model 12 and 12R)
- 58603 (Krystal Klear Model 02 and 603–older, smaller version)
- *CAUTION* The newer models for this 530 GPH pump uses a different o-ring, Part number 13413 with an id approximately of 4.5″. Be sure to measure your old o-ring or the center of the groove it sits in.
- Order 13413 for the modern larger models 530 GPH (603/25FP603) and the bigger modern model 1000 GPH (637).








