377KA Master Lock Coupler Lock,universal Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: MLS377KA Qty On Cart Features Protect unattended trailers with this universal coupler lock. One-size-fits-all design securely encloses coupler socket. Made of hardened steel to pro... Features Back FeaturesProtect unattended trailers with this universal coupler lock. One-size-fits-all design securely encloses coupler socket. Made of hardened steel to provide maximum protection.