CURT 3-Inch Channel Trailer Coupler for 2-Inch Ball — 5,000 lb GTW, Zinc Finish with Posi-Lock Latch

CURT 25100 is a heavy-duty straight-tongue trailer coupler that mounts to a 3-inch channel and secures to a standard 2-inch trailer ball with a 5,000 lb gross capacity.

Built for trailer builders and owners who need a dependable, adjustable connection between tow vehicle and trailer, the CURT 25100 combines robust steel construction with a zinc finish and CURT's Posi‑Lock latch for consistent, secure coupling. Its design fits a 3" wide mounting channel and accepts a 2" diameter ball, delivering a 5,000 lb gross trailer weight (GTW) rating and 700 lb tongue weight (TW) capacity. The latch is lockable and adjustable, making installation and daily use straightforward while resisting corrosion from road and weather conditions.

How does the CURT 25100 attach to my trailer tongue?

This coupler is made to slide onto a 3" wide straight tongue channel and secure with included hardware (not pictured). The internal adjustable nut and Posi‑Lock spring let you tighten the fit around the 2" trailer ball for a snug, rattle-reducing engagement.

• Fits 3" channel tongues—ideal for common straight-tongue frames
• Accepts 2" diameter trailer balls (standard size)
• Adjustable internal nut and Posi‑Lock spring for precise fit
• Installs with basic tools for quick replacement or new builds

What load limits and ratings should I expect?

The CURT 25100 is rated as a Class 3-style coupler with a 5,000 lb gross trailer weight capacity and 700 lb tongue weight. These ratings guide safe pairing with ball mounts, hitch balls, and trailer configurations — always match all components to the lowest rated part of the towing system.

• 5,000 lb gross trailer weight (GTW) rating
• 700 lb tongue weight (TW) capacity
• Designed for standard towing setups using a 2" ball
• Works with Class 3-level towing hardware when properly matched

How does the Posi‑Lock latch improve security and convenience?

CURT's Posi‑Lock latch features a spring-assisted mechanism that holds the hitch ball firmly in the coupler, reducing play and improving connection confidence. The latch accepts a safety pin or a coupler lock, allowing you to secure the trailer when parked or during transit.

• Posi‑Lock spring reduces movement and maintains ball engagement
• Latch design accepts a safety pin or lock for theft deterrence
• Latch adjusts simply by tightening or loosening the internal nut
• Easy one-person operation for hooking and unhooking trailers

How does the finish and material help in real-world use?

Constructed from punched, die-cut steel and finished in durable zinc plating, this coupler resists rust and wear from rain, road salt, and grime—making it suitable for open trailers, utility trailers, and boat trailers. The plating helps the unit maintain fit and function for longer between maintenance cycles.

• Punched, die-cut steel construction for reliable strength
• Zinc finish protects against corrosion and daily wear
• Low-maintenance surface tolerates common outdoor conditions
• Durability suited to frequent towing and seasonal storage

This CURT 25100 coupler includes a limited lifetime warranty and is ideal for trailer owners replacing worn couplers or builders assembling new trailers. It’s best for anyone using a straight trailer tongue with a 3" channel who needs a secure 2" ball connection rated up to 5,000 lbs—boat trailer owners, landscape contractors, utility trailer users, and hobbyist builders will especially benefit from its adjustable latch and corrosion-resistant finish.