Armstrong 4280 S-11-1/2 Repair Kit

Kit to replace seal in Armstrong Model 4280 New Style circulator.

New style circulator can be determined by the discharge line being in the center of the volute. The old style design has the discharge line offset to on side.

Includes 11-1/2" casing gasket

Shaft shaft sleeve

Mechanical seal

Correct seal replacement kit for:

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

Shipping rate for continental USA

$569.00

Add to Cart:
  • Model: 4280S-11-1/2
  • 28000 Units in Stock
  • Manufactured by: Armstrong
Ask a Question
We're currently collecting product reviews for this item. In the meantime, here are some reviews from our past customers sharing their overall shopping experience.
4.9
Out of 5.0
A graph showing this site's review totals.
Overall Rating
98%
of customers that buy
from this merchant give
them a 4 or 5-Star rating.
Verified Buyer
May 20, 2025 by Rick H. (United States)
“Easy process”
Verified Buyer
May 20, 2025 by Dale F. (United States)
“Easy to use. Saved previous order.”
Verified Buyer
May 16, 2025 by A Reviewer (United States)
“My order was received & shipped quickly & efficiently. The price increase was a shock, but I realize the filters are almost obsolete.”

Manufacturer Info

(image for) Armstrong