Fulton Fas Lok Trailer Couplers 2" Ball 3" Channel 34300 0301. The Fas-Lok latching mechanism allows quick and easy trailer hook-up and is factory adjusted for convenience. Fas-Lok is offered in a full line of SAE Class 1 through IV rated straight tongue stamped couplers. The Fas-Lok latching mechanism allows quick and easy trailer hook-up and is factory adjusted for convenience. Class: III. Trailer Weight: 5000 lb. 3" Wide Channel. Features of Fulton 34300 0301 Fas Lok Trailer Couplers 2" Ball 3" Channel Class III coupler Fits 2" hitch balls Channel Size: 3" Weight Capacity: 5000 lbs. Package Contents: Fulton 34300 0301 Fas Lok Trailer Couplers 2" Ball 3" Channel Fulton 34300 0301: Fas Lok Trailer Couplers 2" Ball 3" Channel