The adapter help you use your 50A SS2-50 extension cord to get power from (2) L5-30 30AMP Marine shore power inlet on pedestal. You can use it on Yacht or RV marine style power inlet on pedestal. Input use 10AWG*3 copper inner wire, support each male max 30 Amp loading. Output use 6AWG*4 copper inner wire, support female max 50 Amp overload. Must Plug both two plug for 250V female