Which item has shelf life of 5 years?

• A. V-ring
• B. Viton O-ring
• C. Gasket
• D. O-ring

Answer: (D)

The main idea here is how shelf life is specified for seal types in our maintenance data. In the standard data used for ALREMP, a generic O-ring is the item listed with a five-year shelf life under proper storage. This reflects how elastomeric seals age over time: even when unused, material properties can degrade, affecting elasticity and integrity if stored too long.

The other items are different seals or materials that don’t share this same fixed five-year shelf life in the reference data. A Viton O-ring is a specific material version and may have different aging characteristics; a V-ring and a gasket are different seal forms with their own storage/aging profiles. So, the one consistently listed as five years is the generic O-ring.