Trailer Coupling Lock with Keyed Alike Padlock included. Designed for Fleets who require the Same Key on all Trailer Coupling Locks. Connect to the Truck Trailer Coupling Adaptor, #GP-938-CLMKA or #GP-938-CLFKA Offer Isolation of Truck Trailer Air Brake Connections, Preventing Unauthorised or Accidental Trailer Movement while Unloading or During Maintenance. Use in conjunction with GP-931-08 Male threaded Adaptor or GP-921-08 Female threaded Adaptor.