Got a Hitachi nail gun (like the popular NR83A, NV45AB, or VH650 models) that's leaking air or not firing right? A worn-out trigger valve bushing might be the culprit. This is a genuine Hitachi replacement part (number 877335) sold in a handy 4-pack. These little bushings are crucial for the smooth operation of the trigger valve assembly. They're compatible with a long list of Hitachi pneumatic nailers and staplers (see full list in description – it's extensive!). *Important:* Always shut off the air supply and relieve all pressure from your tool before attempting any repair. Refer to your tool's parts diagram to confirm this is the correct part and for installation guidance. Having a few spares on hand is smart for any pro or serious DIYer, as these are common wear items. Get your favorite nailer back to driving nails like a champ.