0.21" CS × 3.85" ID حلقات O-Ring من Viton FKM | AS568-344 | داش 344 | صلابة 75 | أسود (10 / عبوة)

Needed a precise replacement for a refrigeration line and the 3.85" ID fit perfectly without any forcing. The 75 durometer feels firm but not brittle, and the -15°F rating gives me confidence for winter operation.

The heat resistance on these is what sold me—my old seals kept failing near the engine block, but these Viton rings have held up for months now with zero weeping. The 75 durometer feels firm but seats easily into the groove.

Needed these to replace a worn-out seal on a hydraulic cylinder, and the 75 durometer feels just right—not too stiff, not too soft. The 10-pack is great to have spares on hand for future repairs.