GROCO Replacement Buna-N O-Ring

The GROCO Replacement Buna-N O-Ring (Part Number 2-256) is a precision elastomer seal engineered to maintain watertight integrity in GROCO's ARG and BVS series raw water strainers. This replacement o-ring is compatible with the ARG-1500, ARG-2000, and ARG-3000 strainer models, serving as a critical maintenance component for marine and industrial cooling systems relying on consistent sealing performance under pressure and temperature variation.

Manufactured from synthetic Buna-N rubber, this o-ring delivers proven resistance to saltwater corrosion, petroleum-based coolants, and thermal cycling—key durability factors in offshore and coastal applications. The o-ring's interior diameter of 5.75 inches and outer diameter of 6 inches with 0.125-inch thickness are dimensioned to seat precisely within GROCO strainer bodies, ensuring leak-free operation without requiring adapter hardware or alternative sealing methods. The synthetic rubber compound resists degradation from UV exposure and ozone, extending service life between replacement intervals typical for active raw water systems.

Vessel operators, marine maintenance technicians, and system integrators rely on authentic GROCO o-ring replacements to avoid nuisance seepage, strainer bypass, and potential cooling system contamination. Rather than troubleshooting seal failures with improvised elastomers, purchasing the correct part number ensures compatibility and eliminates guesswork. Sold as a single unit, this replacement o-ring is an economical maintenance item that restores full sealing capability to existing strainer assemblies without requiring complete unit replacement.