• Buna-N resists wear and tear and is often used with petroleum-based chemicals, fluids, and alcohols. Also called nitrile, this material is used in a wide range of sealing applications.
• Hytrel® is a thermoplastic polyester elastomer (TPE) that resists abrasion, high temperatures, and hydraulic oil and water. It is flexible and provides a strong seal.
• PTFE resists acids, ammonia, petroleum products, synthetic lubricants, coolants, and chemicals. This material is durable and rigid and often used with aggressive and corrosive materials.

The substance the product is made from — chosen based on application requirements like durability, temperature, pressure, or chemical/corrosion resistance.

Unit of Measure

The connection size on the first end of the coupling — typically refers to hose, pipe, or thread diameter.

The size (outer diameter) of the second connection end, which may differ if the coupling is an adapter, bolt, or reducer.