The Senco BA0164 Nailer Firing Valve Assembly helps control the air release that activates compatible pneumatic nailers during fastening. This replacement valve assembly works within the nailer’s firing mechanism to regulate airflow and support proper tool cycling when the trigger is operated. A properly functioning valve supports consistent firing, smooth operation, and reliable fast... https://www.wholetoolbox.com/senco-ba0164-nailer-firing-valve-assembly/BA0164.html