Marinco  (1PCMRV) 30 Amp Male to 30 Amp Female RV Locking Adapter
Park Power by Marinco 30 Amp Adapter, 125-V. 30 Amp straight blade (2-pole, 3-wire) RV plug with 30 Amp female locking connector. Includes Easy Lock ring and threaded ring for connector. 30 Amp Male RV to 30 Amp Locking Female.