This "universal" coupler lock is as close to truly universal as any we've found that make the claim.  It fits nearly all 1-7/8", 2" and 2-5/16" couplers, even the old 50s style with the thick rolled front lip.

It has a strong corrosion resistant die-cast housing and a super hardened 5/8" chrome plated shackle. It even has an anti-drill pin in the center of the cylinder for added security.

The cylinder has 3 positions: locked, unlocked, and "ratchet action."

Includes 4 high security keys.