30 amp plug 4 prong to 3 prong adapter July 8, 2019 16 32 64 128 30 amp 3 prong to 4 prong generator plug adapter 3 prong 30 amp dryer plug to 4 prong dryer female connector adapter 3 prong to 2 prong adapter 4 prong 4 prong outlet Plug 3 pin