I need a 120V, 15A, 14AWG GFCI power cord for my spa, do you have one or will this one work? How can 110 be the same as 120?

Hello, it is common to use the terms 110 volt and 120 volt for the same standard household power. Here is a helpful link http://www.ehow.com/info_8044761_110-volt-vs-120-volt.html