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Pump mechanical seals by shaft size

14 mechanical seals for pool, spa, jet and pressure pumps. Find your shaft size below; how to measure it follows the list.

Jump to your shaft size

Not sure of your size? Send us a photo of the old seal and the pump label.

3/8″ shaft

  • PSL-130 Mechanical Seal

    • 3/8″ shaft
    • Carbon / Ceramic
    • Replaces Onga 700273K
    $49.95 Ordered in

1/2″ shaft

5/8″ shaft

3/4″ shaft

1″ shaft

12 mm shaft

13 mm shaft

15 mm shaft

16 mm shaft

17/18 mm shaft

How to measure a shaft

  1. Unplug the pump or isolate it at the breaker, then remove the old seal. If you open the motor end, discharge the run capacitor before you touch anything.
  2. Measure the shaft where the seal sat, with vernier callipers. Be exact: 12 mm and 1/2″ (12.7 mm) are different seals.
  3. Pick imperial or metric. Pumps designed in Australasia mostly use imperial shafts; European pumps mostly use metric.
  4. Check the faces. A dark grey rotating face is carbon and a white or pale grey seat is ceramic; a mirror-hard dark pair is silicon carbide.
  5. Compare with the old seal and keep it until the new one is confirmed. Two seals for the same shaft can still differ in seat diameter and length.

Need bearings as well? See the motor bearing kits, or service kits by pump model.