Three-piece trailer security kit with a coupler lock, DEMCO EZ Latch coupler latch lock, and 5/8" receiver lock for compatible 2" and 2-1/2" Class III, IV, and V receivers.
The InfiniteRule 61637-BX is a three-piece trailer security kit designed to help protect multiple points of a compatible towing setup. It includes a hitch ball and pin-type trailer coupler lock, a latch lock for compatible DEMCO EZ Latch couplers, and a 5/8" receiver lock for compatible Class III, IV, and V receivers.
This kit is useful when the trailer and tow vehicle need security at the coupler, latch, and receiver connection. The included latch lock is listed for DEMCO EZ Latch 1-7/8", 2", and 2-5/16" ball couplers, while the receiver lock is sized for compatible 2" and 2-1/2" receiver applications.
Includes coupler lock, latch lock, and receiver lock
Latch lock fits compatible DEMCO EZ Latch 1-7/8", 2", and 2-5/16" ball couplers
Receiver lock fits compatible 2" and 2-1/2" Class III, IV, and V receivers
Steel coupler body with stainless locking components and aluminum mounting ball
InfiniteRule 61637-BX is not a universal “dual trailer hitch security” kit. It includes three separate locks with different fitment requirements: a coupler lock, a DEMCO EZ Latch coupler latch lock, and a receiver lock. Verify the trailer coupler style, DEMCO EZ Latch ball size, latch lock hole/span/depth, receiver size, hitch pin diameter, receiver lock span, and clearance around each lock point before ordering.
Before Starting: Confirm each lock in the kit matches the correct part of your setup. This kit includes three different locks with different jobs: one coupler lock, one DEMCO EZ Latch coupler latch lock, and one receiver lock. Park on level ground, chock trailer wheels, and inspect coupler, latch, and receiver hardware before installation. Basic Use Steps: 1. Install Coupler Lock: Use the hitch ball and pin-type coupler lock on the trailer coupler while the trailer is parked and uncoupled. 2. Install Latch Lock: On compatible DEMCO EZ Latch couplers, use the included 1/4" latch lock through the coupler latch lock point. 3. Install Receiver Lock: Use the included 5/8" x 3-1/8" span receiver lock to secure a compatible ball mount or hitch accessory in a 2" or 2-1/2" receiver. 4. Check Lock Engagement: Confirm each lock is fully seated and locked with the correct key before leaving the trailer or vehicle unattended. 5. Install Dust Covers: Seat dust covers where supplied to help protect lock cylinders from water, dirt, and road grime. 6. Use Correct Lock at Each Point: Do not interchange the latch lock and receiver lock. Each lock is sized for a different location. 7. Inspect Before Towing: Remove any coupler storage lock before towing and confirm the receiver lock and towing hardware are correctly installed. 8. Store Keys Safely: Keep spare keys in a safe location and record key numbers if provided.
Package Contents: • 1 InfiniteRule coupler lock • 1 InfiniteRule DEMCO EZ Latch coupler latch lock • 1 InfiniteRule 5/8" receiver lock with 3-1/8" span • 6 keys • 2 dust covers • 1 protector NOT Included — May Also Need: • Trailer coupler • Trailer hitch receiver • Ball mount or drawbar • Hitch ball • Anti-rattle device • Wheel lock or wheel chocks • Safety chains, wiring, or towing hardware • Replacement DEMCO coupler latch parts This listing is for the three-piece lock kit only unless otherwise stated. Confirm coupler, latch, receiver, and hitch accessory compatibility before ordering.
To confirm compatibility before ordering, have the following ready: • Trailer coupler brand, model, and ball size • Whether the coupler is a DEMCO EZ Latch 1-7/8", 2", or 2-5/16" ball coupler • Latch lock hole diameter, span, depth, and clearance • Receiver size: 2" or 2-1/2" • Receiver and accessory hitch pin hole diameter • Required receiver lock span across the receiver/accessory combination • Photos of the coupler, latch, receiver, and hitch accessory if fitment is uncertain Why this matters: This kit secures multiple towing points, but each lock has its own fitment requirements. Coupler style, latch geometry, receiver size, and pin span all need to match.
Match this kit by coupler shape, DEMCO EZ Latch fitment, latch lock dimensions, receiver size, receiver lock span, and clearance at each lock point.
If fitment or locking issues continue, check coupler style, DEMCO latch compatibility, latch lock dimensions, receiver lock span, pin diameter, key operation, and whether a different InfiniteRule kit is required.
These locks are theft-deterrent devices and do not replace proper trailer coupling or towing procedures. Remove any storage-only coupler lock before towing. Always confirm the coupler is properly latched, the receiver lock is correctly installed when used for towing, safety chains are attached, breakaway system is connected if equipped, and all towing components are properly rated. Do not tow with damaged, mis-sized, loose, or improperly installed towing hardware.