---
product_id: 8435813
title: "K-Seal HD"
brand: "k-seal"
price: "8665 som"
currency: KGS
in_stock: null
reviews_count: 8
url: https://www.desertcart.kg/products/8435813-k-seal-hd
store_origin: KG
region: Kyrgyzstan
---

# One-step, no flushing needed Heavy-duty, industrial strength Seals leaks in minutes K-Seal HD

**Brand:** k-seal
**Price:** 8665 som
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Seal leaks like a pro—fast, permanent, and hassle-free!

## Quick Answers

- **What is this?** K-Seal HD by k-seal
- **How much does it cost?** 8665 som with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/8435813-k-seal-hd)

## Best For

- k-seal enthusiasts

## Why This Product

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

## Key Features

- • **One Step, Zero Hassle:** Just shake, pour & go—no draining or flushing required
- • **Built for the Big Leagues:** Engineered for heavy-duty, commercial & agricultural vehicles
- • **Fix It Fast, Stay On Track:** Permanently seals radiator, head gasket, freeze plugs & more in minutes
- • **Mechanic-Approved Reliability:** Non-corrosive, clog-free formula trusted worldwide & ASTM D3147 certified
- • **Universal Coolant Compatibility:** Works seamlessly with all antifreeze types for ultimate convenience

## Overview

The ST5516 Heavy-Duty Multi-Purpose Coolant Leak Repair is a 16 oz professional-grade formula designed to permanently seal leaks in water-cooled heavy-duty engines. Compatible with all antifreeze types, it requires no flushing—just shake, pour, and run. Trusted by mechanics and independently tested to ASTM D3147 standards, it delivers fast, reliable, and clog-free repairs for commercial and agricultural vehicles.

## Description

ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

## Features

- FIX IT FAST: Our multi-purpose solution works in minutes to quickly & permanently seal leaks in the radiator, head gasket, freeze plugs, block, heater matrix & water pump of heavy duty vehicles. Fixes most leaks in water-cooled engines
- STOP HOLES & CRACKS: With 1 step our unique formula will seek out each hole & crack, permanently sealing them, without any adverse impact on the efficiency of your engine cooling
- EASY TO USE: K-Seal couldn't be simpler & requires no draining or flushing; just shake, pour & go - shake the bottle, add the fluid to your coolant system & run your engine as normal
- HEAVY DUTY PERFORMANCE: Engineered for large engines & industrial use; suitable for commercial or agricultural vehicles. A permanent repair for the lifetime of the engine. Compatible with all types of antifreeze coolant
- PROFESSIONAL-GRADE RELIABILITY: Trusted by mechanics, our non-corrosive sealer delivers a durable & long-lasting repair, without clogging your cooling system. A cost-effective solution to engine coolant leaks, enhancing the reliability & performance of your vehicle’s cooling system. We've sold millions worldwide & are independently verified by university testing to meet ASTM D3147

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Solv-Tec |
| Brand | K-Seal |
| Model | ST5516HD |
| Item Weight | 1.19 pounds |
| Product Dimensions | 5.9 x 4.1 x 1.9 inches |
| Item model number | ST5516HD |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | ST5516 |

## Images

![K-Seal HD - Image 1](https://m.media-amazon.com/images/I/81sHDXp6ouL.jpg)

## Questions & Answers

**Q: Does it work on potentially warped heads**
A: No idea

**Q: how much do i need to pour in a diesel 1 ton cummins**
A: You need this one bottle for a Dodge 3500 hd.  I have this one bottle in my HD Freightliner 330hp MBZ engine hauling freight (54,000 lbs cap) 6 days a week and it stopped my coolant leak in the engine bay and heater core with no blockage and no.  My opinion, Many reviews say products dont work BECAUSE most people dont take care of their equipment and their vehicles are old, high mileage and no maintenance done.  None of the add to a tank products are as good as replacing with new parts but thats expensive, we get it.  This may or may not fix your problem but its a low cost gamble with a high probability of success.  Dont listen to the negative reviews.  If the problem comes back, your damage was too far gone and in need of replacement anyway.

**Q: Will this work with aluminum heads?**
A: It works equally well with cast iron or aluminum. Great Stuff. Not a long-term solution, but it will buy you a lot of time.

**Q: Tried using alumaseal, which isn't working.  will i need to flush the system before using the k-seal?**
A: I used the HD Truck bottle on my 1998 GEO Tracker ( used 1/3 of the bottle ) of K-Seal and it worked. I have used so many to no avail. To answer your question, I must have @ least 3 to 4 other sealers in my colling  system when I added K-Seal. It's been almost a year & no adverse effects having not flushed my radiator. 
Should I have flushed the radiator & the system? Yes, I should have.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This stuff save me about $20K! It works!
*by M***S on August 14, 2025*

I waited 5 days to write this review on my birthday. Mainly because I am so impressed with this product and I didn't know that it would hold. I'm not getting paid for this review and I rarely write reviews.A little history. I own a 2007 Mercedes E-63. This car is a beast and is a joy to drive. The dealership diagnosed a blown head gasket on the car. The report shows coolant mixed with the engine oil. My oil almost looked like a mocha espresso. A very bad sign. The car was immediately overheating. I was adding antifreeze every day.The dealership estimated repairs to start at $15K but could easily rise to $25K. Once the top of the motor is opened up I'm sure they would recommend new cams (4), new cam adjusters and of course new seals. A new crate engine for this car from Mercedes-Benz costs $57,000.00.After carefully reading the directions I added coolant with the bottle of K-seal after shaking it for 1 minute. Then I drove the car normally for 20-25 minutes. The car came up to temperature and stayed there. It didn't overheat! After feeling terribly about having to sell the car as a mechanic's special or donating the car I can instead enjoy driving the car daily. I did end up changing the oil 3 times before it didn't appear to have any more coolant in it. Thanks K-seal!

### ⭐⭐⭐⭐⭐ It worked!!
*by T***Z on August 11, 2025*

The stuff worked, stopped the leak. Not sure how long it will last but has been 5 days of driving normally. It was really simple by pouring into radiator!!

### ⭐⭐⭐⭐⭐ It does help.
*by T***Y on August 6, 2025*

I can’t say it worked 100%. I was not able to have the product work completely into the system to have it work fully. But it did slow down the leak to where I was only putting 1 gallon of coolant instead of 2 gallons of coolant a day into my truck.I end up getting repairs done sooner than I wanted. One of the seals had a crack in it. That’s why it was leaking coolant into my oil.But the stuff gets all through your system, and I had to flush everything out.It did end up in my oil pan. It did not seem to cause any harm to the system at all.It was easy to pour into the reservoir tank.When you look into the reservoir tank, you can see the small particles of copper.It did not seem to cause my heat level to rise either.

## Frequently Bought Together

- K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
- PEAK 50/50 Prediluted Antifreeze and Coolant for All Engine Cooling Systems
- K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

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**Shop now:** [https://www.desertcart.kg/products/8435813-k-seal-hd](https://www.desertcart.kg/products/8435813-k-seal-hd)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-23*