---
product_id: 51559763
title: "C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey"
brand: "frost king"
price: "AR$232645"
currency: ARS
in_stock: true
reviews_count: 13
category: "Frost King"
url: https://www.desertcart.com.ar/products/51559763-c21cp-c-caulk-saver-bulk-contractor-pack-3-8-inch
store_origin: AR
region: Argentina
---

# Moisture-resistant durability 350 feet continuous length C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey

**Brand:** frost king
**Price:** AR$232645
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal smarter, save bigger — the pro’s secret weapon!

## Quick Answers

- **What is this?** C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey by frost king
- **How much does it cost?** AR$232645 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/51559763-c21cp-c-caulk-saver-bulk-contractor-pack-3-8-inch)

## Best For

- frost king enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Installation:** Flexible yet sturdy foam that installs quickly without tearing or crumbling.
- • **Perfect Fit for Every Gap:** 3/8-inch diameter designed to fill small to medium cracks flawlessly.
- • **Built to Last, Built to Resist:** Water-resistant foam ensures long-term sealing without breakdown.
- • **Maximize Your Caulk Efficiency:** Stretch 350 feet of resilient poly foam to save costly caulk on every project.
- • **Trusted by Pros, Loved by DIYers:** Highly rated with 4.6 stars and a proven track record in contractor packs.

## Overview

The Frost King C21CP-C Caulk Saver is a 3/8-inch diameter, 350-foot long grey polyurethane foam backer rod designed to reduce caulk usage while providing a durable, moisture-resistant seal. Ideal for walls and small gaps, it offers easy installation and long-lasting performance, making it a top choice for contractors and DIY professionals alike.

## Description

Frost King C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey

Review: Reliable Foam Backer That Saves Time and Money - I bought this foam backer to use with caulking around my kitchen wood floor, and it worked better than expected. The material is sturdy yet flexible, making it simple to install without tearing or crumbling. It held its shape, created a clean base, and significantly reduced the amount of caulk I needed to use. I also appreciate that it’s moisture-resistant, which gives me peace of mind. For anyone tackling sealing jobs, this is a cost-effective and dependable solution that makes the work quicker and easier.
Review: Works well. - Should have bought this from the start. I kept buying small amounts from Floor and Decor. Works well, very easy to use and flexible. The size is also perfect for small gaps. Definitely recommend it.

## Features

- Foam
- Saves on expensive caulk
- Works with virtually all caulk
- Moisture repellant
- Made of durable, resilient poly foam
- Easy to use and install

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B016PA9VBW |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #79,477 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #493 in Weather Stripping |
| Brand | Frost King |
| Color | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (904) |
| Date First Available | October 15, 2015 |
| Global Trade Identification Number | 00077578060262 |
| Included Components | Poly Foam Caulk Saver |
| Item Form | Foam |
| Item Package Quantity | 1 |
| Item Weight | 15.4 ounces |
| Item model number | C21CP-C |
| Manufacturer | Frost King |
| Material | Polyurethane |
| Maximum Gap Fill | 3.8 Centimeters |
| Number of Items | 1 |
| Part Number | C21CP-C |
| Product Dimensions | 12 x 9.88 x 10.25 inches |
| Size | 3/8" x diam. x 350 ft |
| Style | 3/8"D X 350'L |
| Surface Recommendation | Walls |
| UPC | 077578060262 |
| Unit Count | 350.0 Feet |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Frost King
- **Color:** Gray
- **Item Form:** Foam
- **Item Weight:** 15.36 ounces
- **Maximum Gap Fill:** 3.8 Centimeters

## Images

![C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey - Image 1](https://m.media-amazon.com/images/I/91TZMmHjiRL.jpg)

## Available Options

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

## Questions & Answers

**Q: Is this waterproof?  Would like to use prior to caulking outside of my cabin**
A: It is waterproof. I would be sure to seal it with some sort of caulk afterwards though

**Q: Is this polyurethane foam?**
A: I think so

**Q: Is this closed cell backer Rod?**
A: I don't know, but it was what i needed to fill cracks.

**Q: What type tool is best for pushing this into the crevice?**
A: I am sure you can find a good tool under caulk finishing or application.  I just used my finger and the butt of a small round screwdriver.  My project was not typical.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable Foam Backer That Saves Time and Money
*by H***A on September 16, 2025*

I bought this foam backer to use with caulking around my kitchen wood floor, and it worked better than expected. The material is sturdy yet flexible, making it simple to install without tearing or crumbling. It held its shape, created a clean base, and significantly reduced the amount of caulk I needed to use. I also appreciate that it’s moisture-resistant, which gives me peace of mind. For anyone tackling sealing jobs, this is a cost-effective and dependable solution that makes the work quicker and easier.

### ⭐⭐⭐⭐⭐ Works well.
*by T***S on December 22, 2025*

Should have bought this from the start. I kept buying small amounts from Floor and Decor. Works well, very easy to use and flexible. The size is also perfect for small gaps. Definitely recommend it.

### ⭐⭐⭐⭐ Great Price!
*by T***H on May 25, 2020*

Great Value!

## Frequently Bought Together

- Frost King C21CP-C Caulk Saver Bulk Contractor Pack, 3/8-inch Diameter x 350-feet Long, Grey
- Mutual Industries Standard Backer Rod, 4000 Linear Feet, 1/4"
- 1/2" Diameter x 200' Length Backer Rod Caulk Saver Foam Backer Rod for Gaps and Joints Backing Concrete Filler

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**Shop now:** [https://www.desertcart.com.ar/products/51559763-c21cp-c-caulk-saver-bulk-contractor-pack-3-8-inch](https://www.desertcart.com.ar/products/51559763-c21cp-c-caulk-saver-bulk-contractor-pack-3-8-inch)

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-02-11*