521 – 1" – Normally Open – EP / Buna / EP (RAN)

This product description likely refers to a specific type of industrial component, possibly a valve or sensor. Here's a breakdown based on the provided information:

• 521: This could be a model number or identification code.
• 1": Indicates the nominal size of the component, likely 1 inch in diameter.
• Normally Open – EP / Buna / EP (RAN):
• Normally Open: This means the component is designed to be open by default and requires an external signal or force to close it.
• EP / Buna / EP (RAN): This likely describes the materials used in the component. "EP" could stand for a specific type of elastomer, while "Buna" refers to a type of synthetic rubber (nitrile). "RAN" might be an additional material specification or manufacturer code.