CZC AUTO Trailer Tongue Coupler Lock 1/4 in x 2-1/2 in, 2-Pack Keyed-Alike — Weather-Resistant

If you tow a trailer, boat, RV, or utility trailer and need a simple, weather-resistant locking solution, these coupler pins offer a compact way to keep the coupler latch immobilized. Each set includes two identical locks and two keys per lock, a watertight rubber cap to block moisture and debris, and a corrosion-resistant finish to extend service life.

How does this lock stop someone from unhitching my trailer?

The CZC AUTO coupler lock slides through the latch mechanism to prevent the coupler from opening. Once inserted and turned with the tubular key, the locking core holds the pin in place so the latch cannot be released without the matching key.

• 1/4" diameter steel pin resists bending when under leverage.
• 2-1/2" effective span fits most latch-style couplers.
• Zinc alloy tubular core and round key for secure engagement.
• Keyed-alike sets let you operate both locks with the same key.

Will it survive outdoor exposure and road salt?

Yes — the lock combines a high-strength steel shaft with a black electrophoretic coating to reduce corrosion and wear. A rubber dust cap seals the head when stored, keeping rain, snow and grit out of the lock mechanism.

• Electrophoretic paint resists chipping and rusting.
• Watertight rubber cap reduces moisture intrusion and ice buildup.
• Compact design sheds dirt and is easy to rinse clean after salty or muddy use.

How easy is it to use day-to-day?

Operation is straightforward: insert the 1/4" pin through the coupler latch, turn the tubular key to lock, then pull on the lock head to confirm engagement. Each set includes two identical locks and two keys, so you can keep a spare on hand or use one set per trailer.

• Insert, turn, and pull to verify locked status.
• Two keys per lock for convenience and backups.
• Lightweight, compact form for quick on/off use at the hitch.

What sizes and applications work with this coupler pin?

The CZC AUTO locking pin is built for latch-type trailer couplers that accept a 1/4" diameter pin with about a 2-1/2" effective span. It’s most commonly used on boat trailers, utility trailers, campers, and small-to-medium towing setups where a through-pin can be installed across the latch.

• 1/4" diameter shaft — check your coupler hole size before purchasing.
• 2-1/2" span fits most standard latch arrangements; measure to confirm fit.
• Popular for boats, RVs, car haulers, and small utility trailers.

Who is this for? The CZC AUTO Trailer Tongue Coupler Lock is aimed at trailer owners who want a simple, low-profile theft deterrent and weather-resistant locking pin. It’s a practical choice for weekend boaters, contractors with small equipment trailers, RV owners, and anyone seeking an inexpensive, keyed-alike solution to keep a latch-style coupler from being opened without the key. CZC AUTO backs the product with a 30-day money-back option and a 12-month warranty for quality-related issues, plus customer support to help resolve fit or operation questions.