No Drilling! Use your breather opening to mount this pickup pipe. Then fit the breather on top. This unique item works without drilling a hole in your Tank!! Supply fuel to an APU and a bunk heater and fuel tank breather all from your existing breather port It simply threads into existing breather port the breather then threads into the top of the standpipe. There are 3 ports: 2 supply lines and 1 return line: · 1 Supply line for 1/4 inch fuel line · 1 Supply line for 3/16 inch fuel line · 1 Return line for 3/16 inch fuel line · 1 plug provided that can plug anyone of the ports if needed Assembly measures as follows: 24" long tubes, 3/4" threads, 3-1/4" top = 28" total length.