LSG 150 left facing

LSG 150

The USA-made LSG 150 is ideal for small leaks with diameters ranging from 2” to 5”. and made of aluminum and stainless steel. Comes with balloon, grounding wire, CO₂ canister, and storage system.
LSG 150 left facing

LSG 400

The USA-made LSG 400 is designed for leaks with diameters ranging from 5” to 14”. and made from the same materials as the LSG 150. Comes with balloon, grounding wire, CO₂ canister, and storage system.

The LSG Stops Leaks of All Sizes

Because all leaks are not created equal, the Leak Stop Gun is available in two models. The LSG 400 is made for stopping leaks from large-diameter tanks and pipes, and the LSG 150 is designed to handle smaller leaks. The two models are made from the same materials, and their differences are highlighted in this table. You’ll also find useful information in the FAQs.

Feature LSG 400 LSG 150
Dimensions 67 in. x 11 in. x 4 in. 44 in. x 10 in. x 3.5 in.
Weight 24 lbs. (11kg) 13 lbs. (6kg)
Tube Material Stainless Steel Stainless Steel
Pistons & End Caps Aluminum & Plastic Aluminum & Plastic
Handle Aluminum Aluminum
Extraction Unit Stainless Steel Stainless Steel
Valves Brass & Stainless Steel Brass & Stainless Steel
Venting Aid for Bubble Brass, Stainless Steel & Copper Brass, Stainless Steel & Copper
Gas Cylinder Material Aluminum & Steel Aluminum & Steel
Hole Diameter Range 5 in. to 14 in. (120mm-350mm) 2 in. to 5 in. (50mm-120mm)
Operating Pressure 1.9-2.0 bar 1.9-2.0 bar

How Does the Leak Stop Gun Work?

General Operation
Pipes & Tanks


1. Why use the LSG 400 instead of the LSG 150?

The LSG 400 is used to seal leaks with diameters ranging from 5 in. to 14 in. (120mm-350mm). In contrast, the LSG 150 is used to seal leaks with diameters ranging from 2 in. to 5 in. (50mm-120mm).

2. What are some common applications for the LSG 400?

The LSG 400 is ideal for use by fire departments, on ships, at petrochemical plants and oil refineries and storage tank facilities, tank truck operators, and in agricultural and biogas environments.

3. What are some common applications for the LSG 150?

The LSG 150 is designed for use with relatively small-diameter pipe leaks such as those caused by excavators used on construction and maintenance projects.

4. How does the LSG work?

Operating the LSG is a straightforward, 3-step process that you can see in action here

5. What kinds of accessories are necessary to operate the LSG?
Everything needed is included in your LSG kit: sealing balloon, CO2 canister, and grounding wire for ATEX environments.
6. How long does the sealing bubble last before it needs to be replaced by a permanent repair?

The LSG sealing balloon is designed to block leaks while a permanent solution is applied. Sealing times vary depending on conditions. Get in touch with us to learn more about your specific application.

7. What Patents do you hold?

Our patents include:

  • USA: Patent # US 10,767,804 B2
  • Canada: Patent # 3,034,762
  • Brazil: Patent # BR112019003716-0

Our Commitment

At Leak Stop Gun, we feel a strong sense of commitment to helping companies and government organizations act responsibly by helping them protect human health and safety, and the environment when emergency leaks and spills occur. This obligation to our fellow citizens of this planet has led us to develop an innovative solution for plugging large, unforeseen leaks on land and at sea. Our deep concern about the safety and well-being of people, as well as our belief that everyone must do his or her part to protect our planet’s scarce natural resources by engaging in sustainable practices, starts with the development of the LSG. This tool is the result of our collective knowledge of engineering, manufacturing, and workplace health and safety to help commercial and government organizations operate safely. The LSG reflects the latest in metallurgy, manufacturing, materials science, and design technologies. As technologies in those realms and others advance, we continue to refine the LSG in our pursuit of helping the world become a safer place.