The Heavy Duty Straight Tongue Coupler from Buyers Products with a welded-on 3 in. channel is made of tough cast steel and is zinc-plated for corrosion resistance. The coupler is available for either a 2 in. or 2-5/16 in. ball and is rated at 10,000 and 15,000 lb, respectively. Each coupler features an auto engage latch that can be easily operated with one hand.