Buy steel fittings if you use them daily! I work in a body shop and use a DA grinder EVERY day. Removers, DA grinders, paint guns, primer guns, etc.) I bought these to replace the old non-HVLP fittings that were on their air hoses at the store.They are made to a high standard but wear out MUCH quicker when used with pneumatic tools like grinders.At the same time I have the fittings on my tools and spray guns replaced.The one on the DA grinder has had to be replaced once but the one on my primer gun still works fine.I think the grinder is the most commonly used tool and due to the heaviest stress on the hose these brass fittings wear out VERY quickly I had problems a few days after putting one of these on my grinder g had done. even remove it from the air coupling Bottom line in my opinion: buy a steel fitting, tiny for hard/frequently used tools.
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