Armstrong Pump Model 4280 Repair Kit 4280S-11-1/2

Armstrong pump model 4280 repair kit P/N 4280S-11-1/2

Includes casing gasket, stainless shaft sleeve, mechanical seal

Kit used with small size new style 4280 pump models:

4280 4x3x11.5,  with 1150 RPM motor 2 HP and smaller

4280 4x3x11.5,  with 1750 RPM motor 5 HP and smaller

4280 4x3x11.5,  with 3500 RPM motor 7-1/2 HP and smaller

Genuine Armstrong pump parts

Shipping rate for continental United States

$569.00

Add to Cart:
  • Model: 4280S-11-1/2
  • Manufactured by: Armstrong Pump
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Verified Buyer
June 14, 2025 by Douglas S. (ILLINOIS, United States)
“a little bit more difficult than previously as I had to search for a bit to find the reorder button. But delivery was very fast so overall a great experience.”
Verified Buyer
June 7, 2025 by Eric W. (United States)
“called up with questions at the end of the day. recieved a great explanation and setup to be able to order parts over the weekend.”
Verified Buyer
June 6, 2025 by Erika P. (United States)
“Quick and easy ordering process!”

Manufacturer Info

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