Inlet Valve & Valve Set Compatible 139F H GX31 4 Stroke Trimmer Brush Cuter

Inlet Valve & Valve Set Compatible 139F H GX31 4 Stroke Trimmer Brush Cuter

• Engagement: Transfers engine torque through a positive keyway fit, stopping slip during heavy pulling.
• Fitment: Key slot width and bore size match the output shaft of most small air-cooled power units.
• Installation: Pre-cut keyway accepts standard flat keys, allowing direct mounting without extra filing.
• Material: Made from heat-treated steel with a polished bore surface to resist scoring from repeated use.
• Operation: Provides gradual take-up action, reducing sudden shock to the driven attachment on start-up.