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This section provides an overview for watertight plugs as well as their applications and principles. Also, please take a look at the list of 9 watertight plug manufacturers and their company rankings. Here are the top-ranked watertight plug companies as of February, 2025: 1.Graybar Electric Company, Inc., 2.Legrand North America, LLC, 3.DQ Marine.
Table of Contents
A watertight plug is a device used to stop the flow of water. Depending on the application, there are two types of plugs: ball plugs, which use air pressure to adhere to the pipe, and mechanical plugs, which do not use air pressure but are made to adhere to the pipe by expanding the diameter by hand-tightening the thumbscrews.
The ball plug can be easily used by simply filling it with air. For this reason, they are often used when temporary water sealing is required, such as for cleaning inside sewage drainage pipes during post-disaster restoration work or for sewage drainage pipeline maintenance work.
The main use of watertight plugs is to stop the flow of water. There are two types, the ball type and the mechanical type, depending on the application.
Watertight plugs are characterized by their ability to stop the flow of water easily. Various types are available, from those suitable for temporary water shutoff during cleaning and repair work to those capable of long-term water shutoff. Because of their simplicity of use and structure, many plugs can be easily used by beginners and are useful in a variety of situations.
Since there are many products available in various sizes and types of water shutoff methods, it is possible to choose the type that best suits the purpose and location of use.
Watertight plugs cannot be used for chemicals, gases, or pressure pipes because they stop the flow of water. They must never be used for these applications because of the risk of plug failure or rupture.
There are two main types of watertight plugs:
There are also air plugs, which use air pressure to inflate the plug to stop the watertight plug. These are available with or without a device called a bypass, which is used to discharge water and air in pipes with large water volumes, or as a special type for permanent installation in large pipes.
There is a wide range of sizes available, and each product has a different diameter of pipe to accommodate each. A wide variety of products are available, from palm-sized plugs to those used in public sewage systems.
When selecting a watertight plug, it is necessary to consider the type to be used depending on how long the plug will be used. When using temporary watertight plugs, use the ball-type or air plugs without bypass. If the watertight plug is intended to be used for a long period, a mechanical type, an air plug with a bypass, or a special type of air plug should be selected.
The next consideration is the diameter of the watertight plug. If the nominal diameter does not match the pipe, the watertight plug will not be effective.
It is also important to check the pressure resistance and material of the plug, since it is expected to be subjected to strong water pressure.
Wear a helmet and safety glasses when working and always check that the pipe diameter and the size of the watertight plug match before inserting the watertight plug into the pipe. Since water pressure is applied, it is necessary to work with full consideration of the possibility of accidents occurring.
Most watertight plugs are simple in construction and easy to use. Ball-type and air plugs are effective when inserted into a pipe and inflated, but there is a caveat that they must be inserted about as far away from the pipe mouth as the diameter of the pipe at the time of installation.
Mechanical plugs have slightly different specifications depending on the product, but they are characterized by a lower diameter expansion rate and do not expand as much as the air-injected watertight plugs mentioned above. Be sure to use a plug that matches the pipe diameter and carefully tighten the thumbscrews.
Since detailed specifications vary by manufacturer and product, it is important to read the instruction manual and use with safety in mind.
*Including some distributors, etc.
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Legrand was established in 1865, and is headquartered in West Hartford, Connecticut. The company specializes in electrical and digital building infrastructures, and serves diverse industries, including residential, commercial, and industrial. Its North and Central American wing is the biggest part of Legrand worldwide which has over 6,700 employees. The company's comprehensive product range includes critical power and infrastructure, lighting controls and systems, AV networking and wire, and cable management. With an ongoing devotion to sustainable solutions, the organization continue to be a longstanding partner in building infrastructures.
Graybar Electric Company, Inc. is a distributor of electrical, communications, and data networking and solutions. The company was founded in 1869 and is headquartered in New York City. Graybar's main activity is the distribution of electrical and communications products, including wire, cable, switches, and lighting. The company also offers a wide range of services, including engineering, installation, and maintenance. Graybar's products are used by a wide range of customers, including contractors, engineers, and manufacturers. It has over 10,000 employees and operates in more than 50 countries.
UC Marine Company Limited, in China, is a manufacturer of marine equipment. The company offers navigation and communication systems are engineered to enhance safety and efficiency on the water including GPS systems, radars, and VHF radios, safety equipment such as life jackets and lifeboats, and a wide array of marine electronics, from chart plotters to fishfinders, to support navigation and fishing endeavors. Its products are in accordance with SOLAS regulations and IMO standards.
Hi-sea Marine was established in 1996, based in Chongqing, China, as a manufacturer and exporter of marine and offshore equipment. The company services include marine equipment and parts supply, including deck equipment, shafting, rudder systems, thrusters, and other auxiliary equipment and parts. It caters to offshore equipment supply, a wide range of industrial equipment and materials, and specialized petrochemical equipment associated with oil and gas products. The company also provides tailor-made production, processing as per client samples, taking on shipbuilding orders, and intricate engineering projects.
Chongqing Jinbo Marine Equipment Import & Export Co., Ltd, was founded in 2013 in Chongqing, China, and is a supplier of marine and offshore equipment for the marine industry. It supplies mooring tools, shipbuilding steel, power and propulsion tools, and navigation systems. Its product catalog for the offshore industry includes personal transfer baskets, mooring chain cables and fittings, platform lifting baskets, and grab baskets. The company's products meet the DNV, RINA, IRS, CCS, and ABS International Class Society Standards.
Englewood Electrical Supply, based in Woodridge, Illinois, was formed in 1919 as a distributor automation distributor of maintenance, repair, and operating products. The company makes power distribution tools, enclosures, wire management, abrasives, and data communications products. It also manufactures fittings, vehicle maintenance tools, sensors, switches, and wiring connectors for the automation, lighting, wire management, and renewable energy industries. It has 17 offices throughout eight states and was acquired by WESCO International Inc. in 1996.
Ranking as of February 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Graybar Electric Company, Inc. |
36.4%
|
| 2 | Legrand North America, LLC |
18.2%
|
| 3 | DQ Marine |
9.1%
|
| 4 | Wenzhou Saige Marine Equipment Co.,Ltd |
9.1%
|
| 5 | Zhejiang Haiji Marine Electric Co., Ltd. |
9.1%
|
| 6 | UC Marine Company Limited |
9.1%
|
| 7 | Hi-sea Marine |
9.1%
|
Derivation Method
The ranking is calculated based on the click share within the watertight plug page as of February 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
5 | 71.4% |
|
United States of America
|
2 | 28.6% |
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