
Viega's ProPress system is a popular choice for plumbing and heating professionals due to its versatility and ease of use. The system offers a range of fittings, including the original ProPress, ProPress SS, and ProPress G, each designed for specific applications. One of the key questions that arises is whether ProPress can be used with diesel fuel. The answer is yes; according to Viega's product specifications, ProPress fittings are suitable for use with diesel fuel, along with various other fuels, oils, and lubricants. The ProPress SS and ProPress G fittings, in particular, are designed for use with fuel oils and gases, making them compatible with diesel fuel systems. Additionally, the sealing elements of the fittings further indicate their compatibility with diesel applications, as the HNBR seal, marked with a yellow color, symbolizes use with diesel, propane, and fuel oils.
| Characteristics | Values |
|---|---|
| Metals used | Copper, stainless steel |
| Sealing elements | EPDM, FKM, HNBR |
| Applications | Potable water, hydronic heating, fire sprinklers, compressed air, propane, diesel, fuel oil, solar, steam, chemical |
| Pipe sizes | 1/2" to 4" |
| Fitting configurations | More than 350 |
| Approved applications | More than 800 |
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What You'll Learn

Viega's ProPress products for plumbing and heating
Viegas ProPress products are recognised leaders in press technology for plumbing and piping systems. The ProPress system offers more pipe fitting configurations than any other brand, with connections that can be made in 7 seconds or less on copper and stainless steel pipes. The range of pipe sizes is also impressive, spanning from 1/2" to 4".
There are several types of Viega PROPress products catering to different needs in the plumbing and heating industry: PROPress, PROPress SS, and PROPress G. The original PROPress is used with copper pipes for potable water, fire sprinkler systems, and compressed air. PROPress SS is designed for stainless steel pipes and is suitable for water, acidic chemicals, fuels, and gases. PROPress G is used with copper pipes for fuel oils and fuel/non-fuel gases.
Viega's product management team ensures that their products meet the changing standards and regulations. For example, as of July 1, 2019, the use of copper PROPress G fittings was discontinued due to updates in American standards.
The MegaPress line, similar to PROPress, also offers multiple versions. MegaPress fittings are compatible with steel and black iron pipes. MegaPress G is suitable for oils, fuel/non-fuel gases, and lubricants, while MegaPress XL offers larger sizes ranging from 2-1/2" to 4".
Viega's commitment to quality and versatility has solidified its position as a global market leader in pipe pressing. With over 4,000 employees worldwide, Viega delivers unparalleled quality and durability, making it the preferred choice for contractors in commercial, industrial, residential, and marine settings.
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Sealing elements for different applications
ProPress is a plumbing and heating system by Viega with more pipe fitting configurations than any other brand, including copper and stainless steel pipes. Connections can be made in 7 seconds or fewer, and the system is used for a variety of applications, including potable water, fire sprinkler systems, and compressed air.
The PROPress product line includes PROPress, PROPress SS, and PROPress G. The original PROPress is used with copper pipes for potable water, fire sprinkler systems, and compressed air. PROPress SS works with stainless steel pipes and is used for water, acidic chemicals, fuels, and gases. PROPress G is used with copper pipes for fuel oils and fuel/non-fuel gases.
The sealing elements for the PROPress system are available in different materials, each suited for specific applications. These include:
- EPDM: Used for potable water, hydronic heating, fire sprinklers, and compressed air. This seal has green and orange markings.
- HNBR: Used for propane, diesel, fuel oil, and lubricant applications. These seals are marked in yellow.
- FKM: Used for solar, steam, chemical, and compressed air applications. These seals are marked in white.
Diesel fuel is a petroleum-derived liquid used in compression-ignition diesel engines. It is composed of long hydrocarbon chains that ignite when compressed and heated but do not vaporize easily. Diesel fuel must have sufficient viscosity, lubricity, ignition quality, and stability to function effectively. It can be produced at home from used motor oil, although this requires proper safety equipment and handling practices.
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MegaPress fittings for steel/black iron pipes
ProPress is a plumbing and heating product with several types of fittings, including copper pipe and stainless steel pipe options. ProPress can be used for potable water, fire sprinkler systems, compressed air, acidic chemicals, fuels, and gases.
ProPress fittings are identified by coloured dots or stickers, which indicate their application. HNBR sealing elements, marked in yellow, represent propane, diesel, and fuel oil applications.
MegaPress is another product with multiple versions, which work with steel/black iron pipes unless otherwise stated. MegaPress fittings are identified by a letter or two, which indicate their application. MegaPress G, for example, is used for oils, fuel/non-fuel gases, and lubricants, and is approved for underground usage. MegaPress XL is similar but comes in larger sizes, ranging from 2-1/2" to 4".
MegaPress fittings are available in various sizes and prices, including:
- 1/2" MegaPress Coupling for $16.89 each
- 1-1/4" M18 Black Iron Press Ring for $530.00 each
- 3/4" MegaPress Cap for $16.25 each
- 3/4" Compact MegaPress Jaw for $230.11 each
- 1-1/4" MegaPress Coupling for $35.42 each
Both ProPress and MegaPress fittings can be used with diesel fuel.
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Copper pipe size compatibility
ProPress can be used on diesel fuel. The HNBR sealing element is used for propane, diesel, and fuel oil applications. These are marked with the colour yellow.
Copper pipes are commonly used in plumbing, HVAC, and industrial applications. They are classified by types (K, L, M, DWV) based on wall thickness and intended use. The size of the copper pipe you need depends on its function and the appliances it needs to connect with. The fixture unit of your appliances in your local building code determines how much water you need to supply, which will determine the size of the pipe needed. The pressure of your water lines decreases as you get higher above your water supply.
Type K copper pipes have the thickest walls and are used underground, for industrial use, or in commercial buildings. Type L copper pipes are the most common type used to distribute water in residential buildings, considering the balance between its durability and price. They are used underground and outdoors. Type M copper pipes are thin-walled and used above ground in residential and light commercial buildings.
The nominal size of a copper pipe can be determined by its outer diameter (OD). The nominal pipe size of a copper pipe is always â…› inch less than the actual outer diameter. If the size is not written on the pipe, you can use the string method to find out.
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ProPress configurations and applications
ProPress is a popular and frequently used system that offers more configurations and applications than any other brand. It is used to join pipes in systems like potable and non-potable water, steam, alcohols, compressed air, industrial processes, and municipal water systems. ProPress is made to work with copper pipes and provides a simple, safe, and effective way to join pipes without the need for soldering or welding.
ProPress copper fittings come in a variety of materials, including stainless steel and copper, which are known for their toughness and resistance to corrosion. The material selection is based on the specific requirements of the application. These fittings are designed to exact specifications, ensuring their structural integrity even under extreme pressures and demands of heating and plumbing systems.
ProPress connections can be made wet or dry in 7 seconds or less on both copper and stainless steel pipes in sizes ranging from 1/2" to 4". All ProPress fittings feature Smart Connect technology, allowing for easy identification of unpressed connections. With no hot work required, there is no need for a fire watch.
Viega offers several types of ProPress products, including the original ProPress, ProPress SS, and ProPress G, each designed for specific applications. The original ProPress is used with copper pipes for potable water, fire sprinkler systems, and compressed air. ProPress SS works with stainless steel pipes and is used for water, acidic chemicals, fuels, and gases. ProPress G, used with copper pipes, is suitable for fuel oils and fuel/non-fuel gases.
ProPress Stainless fittings are engineered for harsh environments where piping systems may come into contact with corrosive materials. They offer more than 350 fitting configurations and are suitable for industrial processes such as utility systems, process piping, and cooling water. The sealing elements of ProPress fittings vary depending on the application, with EPDM, FKM, and HNBR options available.
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Frequently asked questions
Yes, ProPress can be used on diesel fuel. The HNBR sealing element is used for propane, diesel, and fuel oil applications.
ProPress is used for plumbing and heating. Connections can be made in 7 seconds or less on both copper and stainless steel pipes.
There are three types of ProPress products: PROPress, PROPress SS, and PROPress G. PROPress SS works with stainless steel pipes and is used for water, acidic chemicals, fuels, and gases. PROPress G is used with copper pipes for fuel oils and fuel/non-fuel gases.











































