The Senco HA0086 Nailer Trigger Assembly is a replacement control component that regulates air flow to activate the tool when pressed. It functions by opening an internal air valve as the trigger is engaged, allowing compressed air to drive the nail, and closing the valve when released to stop operation. This controlled action supports consistent firing and predictable tool response d... https://www.wholetoolbox.com/senco-ha0086-nailer-trigger-assembly