Armstrong 4280 S-8 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 8" casing gasket

Stainless shaft sleeve

Mechanical seal

Correct seal replacement kit for:

4280 1.5x1x8,   4280 3x1.5x8,   4280 3x2x8,   4280 3x2.5x8,   4280 4x3x8,   4280 5x4x8,   4280 6x4x8,   4280 8x8x8  with 1150 RPM motor 2 HP and smaller

4280 1.5x1x8,   4280 3x1.5x8,   4280 3x2x8,   4280 3x2.5x8,   4280 4x3x8,   4280 5x4x8,   4280 6x4x8,   4280 8x8x8  with 1750 RPM motor 5 HP and smaller

4280 1.5x1x8,   4280 3x1.5x8,   4280 3x2x8,   4280 3x2.5x8,   4280 4x3x8,   4280 5x4x8,   4280 6x4x8,   4280 8x8x8  with 3500 RPM motor 7-1/2 HP and smaller

Shipping rate for continental USA

$604.00

Add to Cart:
  • Model: 4280S-8
  • 25997 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
December 3, 2025 by A Reviewer (United States)
“Always easy to order the filters that I need.”
Verified Buyer
November 29, 2025 by Julie E. (Frederick, MD, United States)
“I searched for a replacement draft inducer assembly with housing. Many places sold separate pieces/smaller kits. I liked the option offered on Shorty's HVAC. I ordered on a weekend, and patiently waited for it to arrive. Packaging was great, and product was as described/brand new. Swapping out was not too bad! My only suggestion is to offer FedEx shipping (in addition to current type) so that these quality parts can get to the site ASAP.”
Verified Buyer
November 26, 2025 by William L. (Florida, United States)
“I could find and purchase my product with ease. Thanks.”

Manufacturer Info