4 Prong Receptacle Socket Fit For 30AMP 125/250V For NEMA L14-30R Secure Locking Design Reliable Power Connection Standard Fit For NEMA L14-30R locking 4-prong receptacle rated 30AMP 125/250V for generator power connection Heavy-duty flame retardant housing , outdoor moisture for Built-in terminals deliver stable power transmission without overheating under full load Clear terminal marking simplifies wiring installation, compatible with standard generator transfer panel setup Locking tab design prevents accidental plug disconnection during vibration from running generators