What most commonly is done with these tanks is a tank fitting is installed in the bottom of the cone. This can be done by the end user or by the manufacture for an additional charge. Off of the tank fitting use a nipple and then a 90° elbow. The nipple length you choose will determine how far down the line will penetrate the stand wall. Then attached to the 90° elbow, a pipe or nipple the appropriate length to reach the outside of the stand wall is needed. Enough of your pipe or nipple will need to be sticking out of the tank stand for you to be able to connect to it. Often what is used at this point is a shutoff valve or you can continue your line to where it needs to go.
Please note that you will have to drill a hole in the stand for your piping to be run thru. Stands feature a wide leg specifically for the purpose of running your line.
All bulkheads, fittings, pipe and valves are sold separately. For help on selecting these parts please contact our technical department for recommendations.