Gas throttle grip switch for FS75 and FS85 trimmers. This OEM replacement part (4137-180-1109) restores throttle control and ensures consistent operation. - Easy installation: quick, hassle-free mounting for a straightforward setup. - Reliable performance: built from durable materials for long-lasting use and dependable throttle response. - Optimal compatibility: designed specifically for FS75 and FS85 trimmers; precise fit and optimal performance. - OEM replacement: replaces OEM part 4137-180-1109; a cost-effective way to maintain or restore functionality. - Use scenarios: - Replacing a worn or malfunctioning throttle switch on FS75/FS85 during regular lawn care. - Routine maintenance to maintain smooth throttle control for edging and trimming tasks. - Seasonal service to restore original throttle feel and prevent intermittent throttle issues.