If your Paslode framing nailer isn't hitting like it used to, this O-ring rebuild kit might be just what you need! It includes all the essential parts to get your F350S or F250s nailer running smooth again: the 402011 cylinder seal, 501001 cap gasket, and 500407 spring - everything shown in the product images. These are the exact parts that wear out over time and cause performance issues. Installation is pretty straightforward if you're handy with tools, and it's way cheaper than buying a new nailer. The parts are brand new, unused, and come in their original packaging. Perfect for contractors, carpenters, or serious DIYers who rely on their Paslode nailers day in and day out. Keep one of these kits in your toolbox for when your nailer starts losing power or leaking air. It's amazing how replacing these few components can make an old nailer work like it just came out of the box. Whether you're doing framing, deck building, or other heavy-duty construction work, having a reliable nailer is crucial - this rebuild kit helps make sure yours stays in fighting shape!