Fits these pumps
Onga: 185 — replaces 700274. Davey: Mukmova · Prime Jet 200–240 — replaces 48800SP.
What you get
Complete 1″ mechanical seal — the heavy version of the standard pump seal, sized for the larger single-phase motors.
How you know it’s this part
Same story as the smaller pumps, bigger puddle: a persistent leak between the pump casing and motor that worsens under load. On these three models the 1″ seal is the fix.
Fitting
Standard wet-end strip-down — allow 40 minutes, and have a second pair of hands for the motor weight. Guides here.
Quality aftermarket part. Not a genuine Onga or Davey product; brand and model names are used for compatibility reference only and remain trademarks of their owners.