Diversi-Tech DT-25013 Lock, The DT Maximum Security Universal Trailer Coupler Lock, DT Diversitech Trailer Pad Locks. DT-25013 Diversi-Tech Trailer Security Coupler Locks. The Diversi-Tech DT-31005 Hitch Pin Lock, Diversa-tech DT-30005 Locking Hitch Pin, DT-32005 Universal Hitch Pin Locks, DT Diversatech DT-40122 padlock. Diversitec DT-39002 hasp and Latch Puck locks. DT-31005 5/8” Locking Hitch Pin.