---
product_id: 58747093
title: "31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations"
brand: "ideal industries"
price: "€ 15.91"
currency: EUR
in_stock: true
category: "Ideal Industries"
url: https://www.desertcart.sk/products/58747093-31-601-duct-seal-compound-1-lb-block-gray-putty
store_origin: SK
region: Slovakia
---

# Paintable for a clean finish Weatherproof & moisture resistant Permanently soft & flexible seal 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations

**Brand:** ideal industries
**Price:** € 15.91
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smart, save energy, and stay ahead of the leak game!

## Quick Answers

- **What is this?** 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations by ideal industries
- **How much does it cost?** € 15.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/58747093-31-601-duct-seal-compound-1-lb-block-gray-putty)

## Best For

- ideal industries enthusiasts

## Why This Product

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

## Key Features

- • **Multi-Surface Mastery:** Adheres seamlessly to metal, wood, plastic, and masonry—versatility for every project.
- • **Ready for the Spotlight:** Paintable immediately after application for a professional, polished look on visible installations.
- • **Flexible Seal That Lasts:** Putty-like compound stays soft—no cracking or shrinking, ensuring long-term reliability.
- • **Ultimate Weather Defense:** Blocks air leaks, moisture, dust, and drafts for superior indoor/outdoor protection.
- • **Safe for Sensitive Components:** Non-corrosive formula protects wiring and surfaces without damage or toxicity.

## Overview

The IDEAL 31-601 Duct Seal Compound is a 1 lb gray putty designed for sealing junction boxes, service entrances, and HVAC penetrations. It creates a durable, flexible barrier that resists air, moisture, and dust intrusion while remaining permanently soft and easy to mold. Safe for use on multiple surfaces including metal, wood, and plastic, it is weatherproof, non-corrosive, and paintable immediately after application—perfect for professional-grade sealing that boosts energy efficiency and protects installations indoors and out.

## Description

Seal gaps, protect installations, and improve energy efficiency with the IDEAL 31-601 Duct Seal Compound. Designed for electricians, contractors, and DIYers, this high-performance sealing putty forms a reliable barrier around junction boxes, service entrances, and conduit penetrations. Unlike traditional fillers that dry out or crack, this permanently soft compound stays flexible over time—allowing for easy adjustments without compromising the seal. Its non-toxic, non-corrosive formula makes it safe for use with sensitive electrical components and a wide range of materials including metal, wood, masonry, and plastic. Ideal for both indoor and outdoor applications, this duct seal helps prevent drafts, moisture intrusion, and pest entry—while maintaining a clean, professional finish that can be painted immediately after use.

## Features

- Air & Moisture Seal: Creates a durable barrier that blocks air leaks, moisture, dust, and drafts around electrical boxes, conduit, and wall penetrations
- Permanently Soft & Easy to Mold: Putty-like consistency stays flexible over time-won't harden, crack, or shrink, making it easy to apply, remove, and rework as needed
- Safe & Non-Corrosive: Formulated to be safe for use around plastics and metals-won't corrode wiring or damage surfaces
- Multi-Surface Versatility: Adheres to metal, masonry, wood, and plastic for electrical, HVAC, plumbing, and general sealing applications
- Paintable & Jobsite Ready: Can be painted immediately after application for a clean finish-suitable for visible installations
- Weatherproof Protection: Provides reliable outdoor and indoor performance by preventing drafts and moisture intrusion through sealed penetrations
- Convenient 1 lb Block Size: Comes in a ready-to-use 1 lb block format that provides ample material for multiple sealing projects and applications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003MZK122 |
| Best Sellers Rank | #5,568 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in HVAC Ducting |
| Brand Name | Ideal Industries |
| Color | Black |
| Compatible Material | Metal, Plastic, Rubber |
| Customer Reviews | 4.7 4.7 out of 5 stars (731) |
| Global Trade Identification Number | 00783250316014 |
| Included Components | Duct Seal |
| Item Dimensions | 8 x 4 x 2 inches |
| Item Form | Putty |
| Item Weight | 16 ounces |
| Manufacturer | IDEAL |
| Material Type | Aluminum, Rubber |
| Model | 31-601 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 31-601 |
| Style Name | Compact |
| Supported Standards | UL |
| Surface Recommendation | Metal |
| UPC | 013227238897 783250316014 |
| Unit Count | 1 Count |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Ideal Industries
- **Item Weight:** 16 ounces
- **Item dimensions L x W x H:** 8 x 4 x 2 inches
- **Material:** Aluminum, Rubber
- **Style:** Compact

## Images

![31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 1](https://m.media-amazon.com/images/I/718Bc2LOwaL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: does this have a adhesive on the back?**
A: No, this is like play dough.  You can mold it into anything.  Hope this helps.

**Q: can this be used in 3 in. PVC conduit service entrance coming out of the ground to block water coming through conduit and feeder wires to the meter?**
A: Yes

**Q: May we know if it has certified by Underwriter's Labotratories?**
A: Yes it is, UL# R11734

**Q: could it be used to fill the gap between the skimmer body and pool concrete siding?**
A: Sure.... It is for outdoor use

## Frequently Bought Together

- Duct Seal 1 lb
- 900 Moldable Silicone Putty - Black
- Rectorseal 81880 1-Pound Duct Seal Compound Gray

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**Shop now:** [https://www.desertcart.sk/products/58747093-31-601-duct-seal-compound-1-lb-block-gray-putty](https://www.desertcart.sk/products/58747093-31-601-duct-seal-compound-1-lb-block-gray-putty)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-09-07*