This AC WORKS brand piggy-back adapter [PBTT30520] is heavy-duty with a 1 ft. L. This cord is a NEMA TT-30 plug and receptacle to a NEMA 5-20R 15/20 Amp household connector. The NEMA TT-30P is a 30 Amp, 3-prong RV/travel trailer male plug. The backside of this plug comes with a matching NEMA TT-30R connector. With this, you can use a variety of power solutions in addition to the female end. Another female end of this cord is a NEMA 5-15/20R, 15/20 Amp, 125-Volt, household connector. Using the piggy-back function, you can run multiple appliances from a NEMA TT-30 outlet, as long as it doesn't exceed 30 Amp. The cable is an STW, 10/3, 30 Amp copper wire 600-Volt anti-cold weather cable staying flexible in extreme temperatures. The cord is super durable and typically used with residential applications, generators and campgrounds. Included with your purchase is a 5-year limited warranty.