If your Hitachi framing nailer (models NR90AD, NR90AE, NR90AF) is leaking air or not firing like it should, this O-Ring Rebuild Kit might be just what you need! It includes every O-ring for the nailer and trigger to help you get it back in working order. Please note: this kit does NOT include gaskets – it's specifically the O-rings. Perfect for DIYers or pros who want to extend the life of their tool without spending a ton on repairs. Easy to install if you're handy, or take it to your local repair shop. Keep your nailer running smoothly and avoid downtime on the job. A cost-effective solution for maintaining your Hitachi nailer's performance. Always make sure to match the model numbers before ordering!