Propane Tank-ard Insulated Beverage Bottle

Step 7 Remove Valve Stem Tube

The pressure release valve stem tube needs to be removed.

The metal tube that housed the stem valve, will interfer with the "shoulders" of the plastic bottle if left in place.
 
The Valve Tube can be drilled out from the top of the tank.
Note: The photo shows the top of the tank cut off - this is not required.  It was done only to better show the Valve Tube
The Valve Tube narrows just below the top surface of the tank thus, a proper size drill bit will remove the tube without disturbing the  flared shoulder on the top surface of the tank.

Paint the inside of the cut tank.

After cutting the Top and Bottom Hole, filing the edges smooth, and removing the Valve Tube, the inside of the tank, and any raw edges of the tank, should be painted.  As shown in the photo below, the exposed inside of the tank will start to rust within a few days if left untreated.

Mask the outside of the tanks so that it does not get paint on it, and give the inside of the tank a shot of spray paint.  Make sure the edges of the top and bottom holes also get painted.