---
product_id: 46803023
title: "Fst-250 Duct Sealant 2\" And Larger Water Block Foam Kit"
brand: "american polywater"
price: "111 kr"
currency: DKK
in_stock: false
url: https://www.desertcart.dk/products/46803023-fst-250-duct-sealant-2-and-larger-water-block-foam
store_origin: DK
region: Denmark
---

# Fast expanding foam Works even in wet conditions Resealable, no waste packaging Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit

**Brand:** american polywater
**Price:** 111 kr
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Seal smarter, not harder — the future of conduit protection is here!

## Quick Answers

- **What is this?** Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit by american polywater
- **How much does it cost?** 111 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/46803023-fst-250-duct-sealant-2-and-larger-water-block-foam)

## Best For

- american polywater enthusiasts

## Why This Product

- Trusted american polywater brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal Adhesion:** Bonds effectively to metal, plastic, and concrete for reliable, long-lasting seals.
- • **Eco-Smart Packaging:** Resealable cartridges prevent waste, saving money and reducing environmental impact.
- • **Versatile Application:** Designed for 2-inch and larger conduits with a reusable high-ratio caulking tool for precision.
- • **Rapid Expansion & Cure:** Foam expands and hardens quickly, even underwater, sealing conduits instantly.
- • **Durable & Chemical Resistant:** Closed-cell foam delivers strong, resilient seals that withstand harsh environments.

## Overview

The FST-250 Duct Sealant Kit features a two-part closed-cell foam that rapidly expands and cures even in wet conditions, providing a strong, chemically resistant seal for conduits 2 inches and larger. Packaged in a resealable cartridge with a reusable application tool, it ensures precision, durability, and zero waste for professional-grade conduit sealing.

## Description

FST Duct Seal is a “closed cell foam”, which is superior to “open cell” spray canned foams. The kit contains a cartridge filled with a two-part foam base, which is mixed in equal parts as it is pushed through a mixing nozzle. When mixed and injected, the foam expands and hardens, keeping things out of the conduit. The foam has good wetting and adhesion to metals, plastics, and concrete. A separate, reusable ratchet application tool is used to inject the foam.

## Features

- Seal Conduit
- Foam expands and cures quickly even when water is present
- FST-250 is used for 2-inch (50mm) or larger conduits and comes in a multi-use single-plunger caulking tube that uses a standard high-ratio caulking tool
- Cured foam is strong, resilient and chemically resistant
- Packages are resealable, no waste

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | American Polywater, Corp. |
| Part Number | FST-250 |
| Item Weight | 2 pounds |
| Package Dimensions | 12.5 x 9.5 x 0.3 inches |
| Color | White |
| Finish | White |
| Power Source | Wired Electric |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |

## Product Details

- **Brand:** American Polywater
- **Item Weight:** 2 Pounds
- **UPC:** 638183893487
- **Number of Items:** 1
- **Color:** White

## Images

![Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit - Image 1](https://m.media-amazon.com/images/I/61tp9EsTj+L.jpg)
![Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit - Image 2](https://m.media-amazon.com/images/I/71V0mIId46L.jpg)
![Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit - Image 3](https://m.media-amazon.com/images/I/81jyZu3oCVL.jpg)
![Fst-250 Duct Sealant 2" And Larger Water Block Foam Kit - Image 4](https://m.media-amazon.com/images/I/71LyApOLi1L.jpg)

## Questions & Answers

**Q: Does it come with mixing nozzle?**
A: Yes it comes with two mixing nozzles.

**Q: Is this just the tube of foam, or the full kit?**
A: Just the tube. Full kit is FST-250KIT1

---

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**Shop now:** [https://www.desertcart.dk/products/46803023-fst-250-duct-sealant-2-and-larger-water-block-foam](https://www.desertcart.dk/products/46803023-fst-250-duct-sealant-2-and-larger-water-block-foam)

---

*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-26*