Fulton Fas - Lok Straight Tongue Coupler to suit your towing needs! SAVE BIG! Featuring classic Fas-Lok latching mechanism for quick and easy trailer hook-up! Steel construction, zinc finish, prime-painted. Guaranteed quality when you order this SAE-certified Coupler! State Channel Size. Order Yours Today! Fulton Fas - Lok Straight Class II Tongue Coupler, 2" ball - 3,500 lbs.