Fittings – connection components for engines & systems
Fittings are essential elements in engine systems, industrial machinery and marine environments. As mechanical connection points, they ensure tight, durable and vibration-resistant links between components. Whether you're dealing with marine fittings for boats or engine fittings for industrial motors, high-quality fittings are critical for maintaining operational safety and performance.
RING UNION - 51981030121 suitable for MAN D-engines
Excellent Ring Union Suitable for MAN D EnginesDiscover the ring union with the comparison number 51981030121, a reliable OEM replacement part compatible with MAN D engines. This precisely manufactured product belongs to the group of fittings and armatures and offers easy installation. Weighing only 0.157 kg, the ring union impresses with its optimal performance characteristics for your engine application.Quality Through OEM Replacement PartsThe ring union specified by the comparison number 51981030121 meets all OEM standards for replacement parts. Comprehensive quality and reliability are the trademarks of products developed for MAN D engines. Trust MOPA Motorparts and our more than 25 years of experience in the industry to find the best solutions for diesel and gas engines.
RING UNION - 51981030120 suitable for MAN D-engines
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RING UNION - 51981030119 suitable for MAN D-engines
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RING UNION - 51981030115 suitable for MAN D-engines
Essential Ring Union for MAN D EnginesDiscover our ring union (part number: 51981030115), an essential product specifically designed for MAN D engines suitable for your applications. This component ensures an optimal fit and long service life.OEM Replacement Parts in Original Equipment QualityWe supply OEM replacement parts that are manufactured in original equipment quality. The ring union is a perfect example of our commitment to quality. The part number 51981030115 allows you to accurately identify the appropriate replacement part. Rely on our expertise to ensure reliable engine operation.
RING UNION - 51981030113 suitable for MAN D-engines
Reliable Ring Union for Efficient PerformanceDiscover the relevant product with the comparison number 51981030113. This ring union is an essential OEM spare part that helps optimize your engine. It has been specifically designed to meet the demands of challenging applications and impresses with its precise workmanship.Safe and Suitable for MAN D EnginesThis ring union is suitable for MAN D engines and ensures seamless integration into your machinery. Unlike replicas, our OEM spare part contributes to the longevity and efficiency of your system. Rely on tested quality and take advantage of a product from the manufacturer.
RING UNION - 51981030109 suitable for MAN D-engines
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RING UNION - 51981030105 suitable for MAN D-engines
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RING UNION - 51981030104 suitable for MAN D-engines
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RING UNION - 51981030103 suitable for MAN D-engines
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RING UNION - 51981030100 suitable for MAN D-engines
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RING UNION - 51981030099 suitable for MAN D-engines
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RING UNION - 51981030098 suitable for MAN D-engines
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RING UNION - 51981030097 suitable for MAN D-engines
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RING UNION - 51981030095 suitable for MAN D-engines
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RING UNION - 51981030094 suitable for MAN D-engines
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RING UNION - 51981030092 suitable for MAN D-engines
A Reliable OEM Replacement Part: Ring UnionDiscover our OEM replacement part, the Ring Union with the comparison number 51981030092. This reliable product is specially manufactured and precisely tailored to meet the requirements of MAN D engines. Weighing only 0.07 kg, it offers comprehensive performance in a practical form. Thus, the Ring Union is the ideal choice for all applications in marine and stationary engines.Precise Fit for MAN D EnginesThis Ring Union is particularly popular as it is designed for MAN D engines, which demand the highest standards of quality. Ensuring that your engines operate optimally is our goal, and for that, MOPA Motorparts provides the best solutions. Our extensive range of replacement parts ensures you are equipped for any challenge.
RING UNION - 51981030090 suitable for MAN D-engines
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RING UNION - 51981030089 suitable for MAN D-engines
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RING UNION - 51981030088 suitable for MAN D-engines
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RING UNION - 51981030087 suitable for MAN D-engines
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RING UNION - 51981030086 suitable for MAN D-engines
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RING UNION - 51981030085 suitable for MAN D-engines
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RING UNION - 51981030082 suitable for MAN D-engines
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RING UNION - 51981030081 suitable for MAN D engines
RING UNION with the comparison number 51981030081 suitable for MAN D engines
Function and benefits
Fittings serve as interfaces between hoses, pipes, housings and mechanical units. In engine systems, reliable engine fittings guarantee that fluids, gases and mechanical forces are securely transferred. Typical benefits of using precision-engineered fittings include:
- Secure and leak-free connections even under high pressure
- Resistance to corrosion, vibration and thermal stress
- Compatibility with various systems – from engines to pumps and cooling circuits
In marine environments, fittings must additionally withstand saltwater exposure and continuous load changes, making marine fittings a category of their own in terms of robustness and reliability.
Types and applications of engine and marine fittings
The category of fittings includes threaded connectors, quick couplings, hose connectors, elbows and T-pieces. Depending on the application, these are used in fuel systems, lubrication circuits, hydraulic control systems or exhaust units. In marine settings, boat fittings must also meet international safety and classification standards.
Engine fittings are commonly integrated in high-load environments such as diesel engines, gas turbines and power units. These fittings must be both dimensionally precise and material-optimized to support system pressure and dynamic loads.
Materials and design features
Fittings are typically made from stainless steel, brass, aluminum or composite materials. In some cases, coatings are applied to improve resistance to corrosion or abrasion. Boat fittings, in particular, are often anodized or sealed for protection against marine conditions.
Advanced design features such as O-ring grooves, reinforced walls or vibration dampers improve the safety and lifespan of engine fittings. Depending on the system, fittings may also be part of quick-connect modules or modular armature systems used in motors and armatures.
Replacement and availability
Over time, fittings can become worn or corroded, especially in aggressive environments or under constant pressure. For safety-critical systems such as marine engines, timely replacement is crucial. We supply a broad range of fittings suitable for MTU, Deutz, MAN, Volvo Penta, and MWM engine types.
Whether you're working with engine fittings, boat fittings or components related to motors and armatures, our warehouse ensures fast availability and OEM-level compatibility. Each engine armature or connection unit is carefully selected for durability and ease of installation.
Questions and answers
What is fittings?
Fittings are mechanical components used to connect pipes, hoses or structural elements in engines, industrial systems and marine applications. They are designed to ensure tight, secure and durable connections and are available in many shapes, sizes and materials.
How do fittings work?
Fittings work by mechanically joining two components, often using threads, clamps or pressure seals. In engines and motors, engine fittings maintain the integrity of fluid and air systems, while in boats and ships, marine fittings are essential for safe and corrosion-resistant connections. In the context of motor armatures, fittings help align and stabilize moving parts within dynamic systems.