Wiring recommendations

I have an older power awning and I am updating the arm on the power side to have the 'release' mechanism. I already replaced the other one so this way I will have both arms that release or 'break away'. Anyway, my question is I have to reroute the power wire that runs up the arm and extend it a little bit. At each end it needs to have a 2 connector 12v plug almost like a trailer connector only with 2 wires. These are easy to find. I am basically making a short extension cord for my awning motor. My question is what wire to use. I need a 2 conductor probably 14 or 16 gauge in a rubberized 'loom'. I am trying to find what specification I need for it since it is outside all of the time. I don't think SJ provides what I am looking for.

Thanks,

Steve