Right renal v.

The renal veins are veins that drain the kidney. They connect the kidney to the inferior vena cava. They carry the blood purified by the kidney. There is one vein per kidney, that divides upon entering the kidney. The right renal vein drains directly into the inferior vena cava. 

Because the inferior vena cava is on the right half of the body, the right renal vein is usually shorter than the left.