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And is simple to install and remove. Limited Lifetime warranty. These locks protects unattended trailers and guards against tow-away theft. Made with reinforced zinc die-cast resists rust and corrosion. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key.
The universal trailer coupler lock fits 1-7/8in 48mm, hammerblow, dutton, Lainson, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Atwood, Shelby, Valley, Fulton, Putnam, and UFP. It also rotates less rigidity making it harder to break with sledge hammer force. Each lock weighs 2. 4 lbs. In stock with a delivery time of 1 to 5 days. Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying.

The same key opens all three locks. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack.
In stock with a delivery time of 1 to 5 days. Made with reinforced zinc die-cast resists rust and corrosion. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. It also rotates less rigidity making it harder to break with sledge hammer force. Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, plastics, crimping and riveting operations.





For 2-5/16" couplers we recommend a different lock, search Master Lock 379KA. Limited lifetime Warranty provides peace of mind from a brand you can trust. Advanced locking mechanism resists picking and prying.

Electroplated and powder coated finish. Fits most enclosed, boat, car, flatbed, landscape, and utility trailer on the market today.


1. Master Lock
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3 Keyed Alike Universal Trailer Coupler Locks 379KA-3, Master Lock
#adMaster Lock #ad - Zinc alloys offer high strengths to 60, crimping and riveting operations. The same key opens all three locks. Impact resistance is significantly higher than cast aluminium alloys, plastics, 000 psi and superior elongation for strong designs and formability for bending, and grey cast iron.And is simple to install and remove. Limited Lifetime warranty. These locks protects unattended trailers and guards against tow-away theft. Made with reinforced zinc die-cast resists rust and corrosion. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key.
More information #ad
This simple design is difficult to defeat because when it's locked on the trailer the lock rests on top of the coupler see image thus thwarting blunt force from downward hammer strikes. The universal trailer coupler lock fits 1-7/8in 48mm, hammerblow, dutton, Lainson, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Atwood, Shelby, Valley, Fulton, Putnam, and UFP. It also rotates less rigidity making it harder to break with sledge hammer force. Each lock weighs 2. 4 lbs. In stock with a delivery time of 1 to 5 days. Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying.
Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Weight | 2.4 Pounds |
Part Number | B007C4US1S |
Model | 379KA-3 |
Warranty | MASTER LOCK PRODUCT WARRANTY Limited Lifetime Warranty Master Lock Company LLC (“Master Lock”) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
2. Trailer Coupler Locks - Keyed Alike
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3 Keyed Alike Universal Trailer Coupler Locks 379KA-3, Master Lock
#adTrailer Coupler Locks - Keyed Alike #ad - Few materials provide the strength and toughness of zinc alloys. Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. This simple design is difficult to defeat because when it's locked on the trailer the lock rests on top of the coupler see image thus thwarting blunt force from downward hammer strikes.The same key opens all three locks. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack.
More information #ad
The universal trailer coupler lock fits 1-7/8in 48mm, valley, 2in 51mm and most 2-5/16in 59mm couplers by Reese, Fulton, Shelby, Dutton, Putnam, Atwood, Lainson, Hammerblow, and UFP. Limited Lifetime warranty. Each lock weighs 2. 4 lbs. And is simple to install and remove. In stock with a delivery time of 1 to 5 days. Made with reinforced zinc die-cast resists rust and corrosion. This is a set of 3 keyed alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. It also rotates less rigidity making it harder to break with sledge hammer force. Zinc alloys offer high strengths to 60, 000 psi and superior elongation for strong designs and formability for bending, plastics, crimping and riveting operations.
Brand | Trailer Coupler Locks - Keyed Alike #ad |
Manufacturer | Trailer Coupler Locks - Keyed Alike #ad |
Weight | 2.4 Pounds |
Part Number | 379KA3 |
Warranty | MASTER LOCK PRODUCT WARRANTY: Limited Lifetime Warranty. Master Lock Company LLC (Master Lock) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
3. Trailer Coupler Locks - Keyed Alike
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1 Keyed Alike Universal Trailer Coupler Locks 379KA, Master Lock
#adTrailer Coupler Locks - Keyed Alike #ad - Each lock weighs 2. 4 lbs. Resists rust and corrosion. Limited lifetime warranty. Fits virtually all 1-7/8, 2", and 2-5/16" couplers. Simple installation and removal.More information #ad
A high quality trailer coupler tongue lock. Advanced locking mechanism resists picking and prying and is rekeyable - for rekeying see your authorized Master Lock locksmith.Brand | Trailer Coupler Locks - Keyed Alike #ad |
Manufacturer | Trailer Coupler Locks - Keyed Alike #ad |
Part Number | 379 |
Warranty | MASTER LOCK PRODUCT WARRANTY: Limited Lifetime Warranty. Master Lock Company LLC (Master Lock) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
4. Master Lock
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Black, Master Lock 379ATPY Universal Trailer Hitch Lock
#adMaster Lock #ad - 51mm and most 2-5/16 in. 59mm trailer couplers. Trailer hitch lock is constructed from zinc to resist rust and corrosion. Includes one trailer coupler lock, two keys.More information #ad
48mm, 2 in. Trailer lock is best used for vehicles, trailers, and RVs. Trailer hitch lock fits 1-7/8 in. Trailer coupler lock features advanced locking mechanism to resist picking and prying.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 4.6 Inches |
Length | 5.1 Inches |
Weight | 2 Pounds |
Width | 3.5 Inches |
Part Number | 379ATPY |
Model | 379ATPY |
Warranty | 1 year manufacturer |
More information #ad
5. Master Lock
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Master Lock, Trailer Locks #389DAT, Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers
#adMaster Lock #ad - Resists rust and corrosion. Simple installation and removal. This lock protects unattended trailers and guards against tow-away theft. Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.More information #ad
The bright red finish discourages thiefs from messing with your trailer. Advanced locking mechanism resists picking and prying.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 7.5 Inches |
Length | 6.5 Inches |
Weight | 1 Pounds |
Width | 4 Inches |
Part Number | 389DAT |
Model | 389DAT |
Warranty | MASTER LOCK PRODUCT WARRANTY Limited Lifetime Warranty Master Lock Company LLC (“Master Lock”) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
6. Master Lock
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Coupler Lock, and Latch Lock, 3 Components Keyed Alike, Receiver Lock, Master Lock 3895DAT
#adMaster Lock #ad - For more detailed information, please click "See More Product Details". The limited lifetime Warranty provides peace of mind from a brand you can trust. Complete trailer security system KEYED ALIKE.More information #ad
This lock set can not be keyed alike with other locks nor can 2 of these lock sets be keyed alike. 1 coupler lock, 1 receiver lock & 1 latch lock all keyed alike; 1 key opens all 3 locks.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Height | 3.5 Inches |
Length | 9 Inches |
Width | 6.25 Inches |
Part Number | 3895DAT |
Model | 3895DAT |
Warranty | MASTER LOCK PRODUCT WARRANTY: Limited Lifetime Warranty. Master Lock Company LLC (Master Lock) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
7. Master Lock
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Master Lock, 4 Keyed Alike Trailer Coupler Locks 377KA-4, Fits 1-7/8" and 2" Couplers
#adMaster Lock #ad - This listing is for 4 four 377KA coupler locks keyed alike and 8 keys. Durable design: aluminum diecast finish resists rust and corrosion.For 2-5/16" couplers we recommend a different lock, search Master Lock 379KA. Limited lifetime Warranty provides peace of mind from a brand you can trust. Advanced locking mechanism resists picking and prying.
More information #ad
Attention: if you order two 4-packs they will NOT necessarily be keyed the same. To ensure you get two 4-packs keyed alike, you must order the 8-pack. Specifications: fits 1-7/8", 2" and some 2-5/16" trailer couplers. Easy to install and remove.Brand | Master Lock #ad |
Manufacturer | Master Lock #ad |
Weight | 8 Pounds |
Part Number | 377KA-4 |
Model | 377KA-4 |
Warranty | MASTER LOCK PRODUCT WARRANTY: Limited Lifetime Warranty. Master Lock Company LLC (Master Lock) grants the following warranty: If this product or any part of the product fails due to a defect in materials or workmanship at any time during the life of the product, Master Lock will, at its own discretion, repair or replace the product or part free of charge. Simply contact Master Lock at www.masterlock.com or 1.800.464.2088 for instructions on obtaining repair or replacement. |
More information #ad
8. InSite Solutions
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Secure Trailer Hitch Lock, Durable, Red, Equipment Lock BRHL, Steel Ball and Ring Hitch Lock, Electro-Plated and Powder Coated Finish, Trailer Accessories
#adInSite Solutions #ad - High quality: built with 3/8″ plate steel and a 1″ solid steel shaft. Does not fit airstream trailers universal fit trailer locks: Universal for any size ball: 1-7/8", 2", 2-5/16" or ring/pintle type hitch.Electroplated and powder coated finish. Fits most enclosed, boat, car, flatbed, landscape, and utility trailer on the market today.
More information #ad
Keep your belongings secure: ensure maximum security for your trailers. Keyed security lock: Built in high security barrel lock system including 2 keys. Easy installation: Easy to follow instructions to ensure maximum protection for your trailer or storage container.Brand | InSite Solutions #ad |
Manufacturer | The Equipment Lock Company #ad |
Height | 4.1 Inches |
Length | 8.1 Inches |
Weight | 1 Pounds |
Width | 5.7 Inches |
Part Number | BRHL |
Model | B005CIGVGM |
More information #ad
9. DEF
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DEF Coupler Lock Hitch Trailer Lock with 2 Keys Heavy-Duty Steel Fits 1-7/8" 2" and 2-5/16" Replaces#72783 Yellow and Chrome
#adDEF #ad - Easy to assemble. Bright yellow color is durable, highly visible, and an essential accessory to all types of trailers. Compatibility: ratchet design is adjustable with 11 locking positions and fits 1-7/8", 2", and 2-5/16" couplers.More information #ad
Fully adjustable universal fit. Easy and quick to install and remove. These u-shaped locks fit over the coupler on the trailer's tongue and prevents someone else from hooking up his vehicle to your trailer. Safety:help prevent tow away, Heavy Duty cast Steel universal coupler lock.Brand | DEF #ad |
Manufacturer | Beauty-Life #ad |
Part Number | BL-TOOL127 |
Model | BL-TOOL127 |
More information #ad
10. Rhino USA
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Used to Tow Truck, Boat, Rhino USA Trailer Hitch Lock, Weatherproof Anti-Theft Lockable Pin with Dust, Bike, Mud & Gunk Protection, Patented 5/8" Locking Receiver Pin for Class III IV Hitches
#adRhino USA #ad - Guaranteed 5-star experience - if you aren't 100% Satisfied for any Reason, We'll Refund your Money. Patent pending design - newly Added Weatherproof Slide Cap Protects From Dirt, Mud & Gunk. Common hitch sizes - our unique hitch pin Fits all Class III & IV Hitches 2" x 2" With Ease.More information #ad
American owned, family operated - join the rhino family & support a USA based Father/Son Business! Anti-theft hitch pin - solid forged Steel Ensures Protection to Your Trailer & Hitch From Theft.Brand | Rhino USA #ad |
Manufacturer | Rhino USA, Inc. #ad |
Part Number | HITCHPIN-P |
Model | HITCHPIN-P |
Warranty | Unlimited Lifetime Warranty Included |
More information #ad