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Worn or cracked couplers are a safety item worth replacing outright rather than patching, and this Buyers Products coupler covers the common 2-5/16" ball size used on heavier trailers. It's cast rather than stamped, which gives it more material at the stress points around the ball socket and latch.
The channel-mount base is designed to bolt or weld onto a trailer's frame channel, making it a straightforward swap for an existing coupler of the same mount style.
Match the ball size and channel width to your existing trailer tongue before ordering, since couplers aren't interchangeable across different frame widths.