---
product_id: 286284163
title: "Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700)"
brand: "comstar"
price: "$81.84"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/286284163-comstar-a-c-zero-leak-4-oz-plastic-container-90
store_origin: US
region: United States of America
---

# Eco-friendly & polymer-free formula Stops hairline leaks effectively Compatible with all major AC lubricants Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700)

**Brand:** comstar
**Price:** $81.84
**Availability:** ✅ In Stock

## Summary

> 💨 Seal leaks, not your peace of mind!

## Quick Answers

- **What is this?** Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) by comstar
- **How much does it cost?** $81.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/286284163-comstar-a-c-zero-leak-4-oz-plastic-container-90)

## Best For

- comstar enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Smart Choice:** Environmentally safe, supporting sustainable maintenance
- • **Clog-Free Assurance:** Polymer-free formula prevents hardening and system blockages
- • **Leak-Proof Confidence:** Seals evaporators, condensers, gaskets & seals with precision
- • **Versatile Application:** Ideal for automotive, commercial, and residential AC systems
- • **Universal Compatibility:** Works seamlessly with POE, PAG, and mineral oil lubricants

## Overview

Comstar A/C Zero Leak is a 4 oz. polymer-free leak sealant designed to stop small leaks in evaporators, condensers, gaskets, and seals across automotive, commercial, and residential AC systems. Its unique formula prevents clogging and hard particulate formation, ensuring system longevity while being environmentally safe and compatible with all major AC lubricants.

## Description

Stop hairline leaks in evaporators and condensers AND around gaskets and seals. This unique product contains no polymer, which means no clogs and no worries! This distinct advantage over competitive products ensures A/C Zero Leak will not form hard particulate when it comes in contact with moisture in a system. For commercial and residential A/C applications, a 4oz dose (1 bottle) is fit for up to a 12 ton system.   A/C Zero Leak can also be used for preventive maintenance and be left in an operating system.

## Features

- ComStar’s A/C Zero Leak is specially formulated to stop small leaks in evaporators and condensers as well as around gaskets and seals
- It can be used in automotive, commercial and residential AC applications
- It does not harm AC systems and because it is polymer-free it does not harden or clog the system
- It is compatible with POE-based, PAG-based and mineral-oil based mobile AC lubricants
- Environmentally safe

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | ComStar International, Inc. |
| Item model number | 90-700 |
| Product Dimensions | 4.27 x 4.27 x 11.89 cm; 113.4 g |
| ASIN | B01C40JEH8 |

## Product Details

- **Brand:** Comstar
- **Package information:** Bottle
- **Liquid volume:** 4 Fluid Ounces
- **Item weight:** 4 Ounces
- **Recommended uses for product:** Automotive

## Images

![Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) - Image 1](https://m.media-amazon.com/images/I/71fXGI+e6XL.jpg)
![Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) - Image 2](https://m.media-amazon.com/images/I/71sZmtB5dLL.jpg)
![Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) - Image 3](https://m.media-amazon.com/images/I/71hXwi7X-XL.jpg)
![Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) - Image 4](https://m.media-amazon.com/images/I/71nGiCjNzkS.jpg)
![Comstar A/C Zero Leak, 4 oz. Plastic Container (90-700) - Image 5](https://m.media-amazon.com/images/I/81bDYhBs2MS.jpg)

## Questions & Answers

**Q: I have a 4 ton system how many OZ will needed ?**
A: A/C Zero Leak, as well as other types, uses the amount of refrigerant in a system to determine how much stop leak should be used, not by the size (Tons) of a system.  The rule of thumb is 2 to 4 lbs of refrigerant per ton.  Therefore, you need to find out how much refrigerant your system operates on.  The minimum refrigerant in a 4-ton system would be 8 lb and the maximum would be 16 lbs.   A/C Zero Leak dosage is 1 ounce per each lb of refrigerant.

**Q: Is this a 4 oz or 2 oz product? Both figures are listed on the same product page.**
A: My bottles contained 4 oz. Not sure if there is a smaller size available.

**Q: It says compatible with poe systems.  is this compatible with high voltage compressors in hybrids and electric cars?**
A: A/C Zero Leak is compatible with POE oils and A/C systems in hybrids and EVs.

**Q: How bad is too bad of a leak ,for it not to work,mine leaks out in about a day n a half**
A: It will not work on that leak.

## Frequently Bought Together

- ComStar A/C Zero-Leak, Permanent "Stop Leak" for A/C Systems, Seals Leaks Instantly, Non-Hardening, Polymer-Free, Eco-Friendly, Made in USA, 4 Ounces (90-700)
- X AUTOHAUX Oil and Dye Injectors Kit 30ml/1 Oz Hand Push Compressor Manual AC Oil Dye Injector with Quick Coupler 1/4 SAE Connector Car HVAC Compressor Oil Dye Injector Refrigerant Tool

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-22*