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This section provides an overview for conversion fittings as well as their applications and principles. Also, please take a look at the list of 11 conversion fitting manufacturers and their company rankings. Here are the top-ranked conversion fitting companies as of March, 2026: 1.COLD HOSE, 2.Don Brown Bus Parts, 3.Power Drives, Inc..
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A conversion fitting is a type of fitting that connects, redirects, and branches pipes of different types.
Pipes are made of different materials, such as alloy steel pipe, stainless steel pipe, aluminum pipe, copper pipe, polyethylene pipe, and each material is used according to the type of fluid to be transported, the purpose of transport, and the environment surrounding the pipe. However, conversion fittings are used in situations such as when pipes of different materials are used inside and outside a building, or when different types of pipes are connected to existing pipes during renovation work, etc.
In addition, there are situations where different types of threads are connected using the screw-in method, which is one of the connection methods of fittings. Fittings used in such situations are specifically referred to as screw conversion fittings.
Conversion fittings are used to connect pipes of different materials or with different types of threads in piping used to transport gases, liquids, etc.
Conversion fittings are used to connect dissimilar pipes in a wide range of fields, including water supply facilities, hot water supply facilities, drainage pipes, sewage pipes, ventilation pipes, gas pipes, circulating fluid temperature control facilities, fire prevention pipes, vacuum pipes, agricultural water pipes, and chemical plant pipes.
In particular, copper pipes with strong antibacterial properties have long been used in water supply and hot water facilities, but in recent years, stainless steel and polyethylene pipes are often used, and conversion fittings are increasingly being used to connect existing copper pipes.
When using conversion fittings to connect pipes of different materials, especially when connecting pipes of different metals, it is necessary to consider corrosion caused by contact between the different metals.
When metals with different ionization tendencies come into contact with each other in an electrolyte such as water, a potential difference is created between them, with the base metal with the higher ionization tendency becoming the anode and the noble metal with the lower ionization tendency becoming the cathode, forming a battery. Metal ions with a positive charge flow out from the anode side of the battery, and the anode side (base metal side) is corroded. This phenomenon is called dissimilar metal contact corrosion (galvanic corrosion).
For example, when connecting stainless steel and copper pipes, there is almost no potential difference between the two types of piping because they have the same ionization tendency. Therefore, there is no problem even if stainless steel and copper pipes are in direct contact.
On the other hand, when stainless steel and brass pipes are connected, the zinc in the brass has a high ionization tendency, so connecting these two types of piping forms a battery due to the potential difference between them, causing galvanic corrosion of the brass.
To prevent this, conversion fittings must be electrically insulated. Forms of insulation include the flange type with insulating bolts, the insulated union type, and the screw-in type with insulating material attached to the threaded part.
*Including some distributors, etc.
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Hy-Lok USA, Inc., established in 1977 and headquartered in Stafford, Texas, USA, is a manufacturer and supplier of fluid and gas control solutions. The company’s main products encompass a comprehensive range of quality instrumentation valves, fittings, and connectors used in critical applications across industries such as oil and gas, petrochemical, and semiconductor manufacturing. For their engineering excellence, Hy-Lok USA plays a pivotal role in ensuring dependable and particular fluid handling, contributing to operational efficiency and safety. As a manufacturer and supplier, they are loyal to delivering advanced solutions that meet the intricate requirements of modern industrial processes.
Power Drives, Inc., established in 1946 and located in Buffalo, New York, USA, is a manufacturer of industrial automation products. The company specializes in designing, producing and distributing pneumatic and hydraulic components, assemblies and systems. The company provides OEMs with tube assemblies and engineered hoses, right from building the prototypes to the final products. The company also has five Express Hose Centre locations, for on-site fabrication processes. The company is engaged in producing and distributing products for industrial fluid transference and treatment.
Nihon Pisco Co. Ltd., founded in 1976 and based in Nagano, Japan, is a manufacturer and distributor of pneumatic equipment and is ISO 9001 and ISO 14001 certified. The company stocks various products like valves, actuators, and vacuum accessories used in several industries, including semiconductor, medicine, and rechargeable battery. The company started selling push-in fitting for pneumatic piping in 1977 and launched the industry’s first push-in fitting built-in type speed controller in 1981. In 1993, it launched a few products, including a quick exhaust valve, a digital pressure sensor, and a vacuum generator with a digital pressure sensor.
Jiayuan established in China, in 1998, is a manufacturer engaged in machinery accessory and connection of hydraulic pipe with the Certificate of ISO 9001. Their product line includes diaulic system connection including tube fittings connector, hose assembly, flange block, valve and accessory. The company's products are used in industries such as construction, infrastructure development, agriculture, transportation and mining. The company has distribution channel in Japan, Germany, UK, France, Sweden and Korea.
Parker Hannifin Corporation was founded in 1917 and is headquartered in Cleveland, Ohio. Parker Hannifin is a manufacturer and distributor of motion and control technologies and systems for markets including mobile, industrial, and aerospace. Parker-Hannifin operates through two segments: diversified industrial and aerospace systems. Diversified industrial offers sealing, shielding, thermal products and systems, adhesives, diagnostics solutions, and hydraulic, pneumatic, and elctromechanical components and systems or industrial machinery and equipment. The aerospace segment offers control actuation systems and components, engine exhaust nozzles and assemblies, pilot controls, as well as others.
Ranking as of March 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | COLD HOSE |
15.8%
|
| 2 | Don Brown Bus Parts |
12.3%
|
| 3 | Power Drives, Inc. |
12.3%
|
| 4 | Scott Equipment Co., Inc. |
10.5%
|
| 5 | Fluid Line Products, Inc. |
8.8%
|
| 6 | Home-Flex |
7.0%
|
| 7 | Hy-Lok USA, Inc. |
7.0%
|
| 8 | PARKER HANNIFIN CORP |
7.0%
|
| 9 | Regal Joint Co., Ltd. |
7.0%
|
| 10 | Consus Co., Ltd. |
3.5%
|
Derivation Method
The ranking is calculated based on the click share within the conversion fitting page as of March 2026. 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 (%) |
|---|---|---|
|
United States of America
|
4 | 50.0% |
|
Japan
|
3 | 37.5% |
|
China
|
1 | 12.5% |
195 products found - Page 2
195 products - Page 2
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Stainless steel is also available depending on the size.
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