if the did clone has the same size fill hole then the regular real did, then what i use is 16g blunt tip needle, this is 3in long and reaches to the bottom of tank, as long as the needle will rech to the bottom you wont have any issues with filling. also whats nice about the 3in size is it will reach all the way to the bottom of a 30 ml bottle of juice. avid vapors carrys them for about 3 dollars. if this diameter is to big you will have to go to a smaller size, which is a larger number. i believe as long as the needle is 1-1/2 in lenght it will work. these are luer lock tips that fit into a luer lock syringe. you can purchase cheapy plastic luer locking syringes anywhere for pennys, but i like the pyprex syringes, the 2ml size is perfect and they cost about 12 dollars. i purchase them from ntt glass syringe. but like i said before i am not sure on the size of the did clones fill hole, so you will have to check. the 16g could be to thick, so might have to go to 18 or 20g