حلقات O من مطاط بونا-إن نيتريل | AS568-458 | داش 458 | صلابة 70 | أسود (10 / عبوة)

The 70 durometer is just firm enough to seat perfectly in my air compressor fittings without leaking. These black Buna-N rings handled a weekend project at 200°F with no signs of wear.

I've been using these for a hydraulic repair job and the 70 durometer feels just right—firm enough to hold pressure but not brittle. The temperature range covers my gear perfectly, and they seated without any hassle.

These arrived in a sturdy little bag, which is good because I already had to root through them twice for a project. The 70 durometer hardness feels just right for the hydraulic fitting I needed to seal, and they slipped on without any wrestling. Solid pick if you're tired of squishy cheap rings.