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NYLOG: This is a must have to seal deep vacuum parts, seals, hose fitting, service gauge fittings, any part that had a seam or seal. ANY good A/C TECH will have a bottle in his tool box or something like it. it's been around before I can remember. When you first buy your new manifold gauge, take them all apart, remove all seals out of the hose ends, service valves, any mating part and apply NYLOG inside and out all over. For sure you will not have a vacuum leak at this point !.