Yup. No sealant necessary.
If you measure from the top of the lip where the cap screws on down to the "fill" line, cut a length of plastic or copper tubing that length plus 1/4" or so, that can cram into the fitting in the cap (pressure fit). That will set the final depth of the fluid in the reservoir after you're done.
Attach the cap and tube from the tank, pump it up 4 or 5 pumps or so (10 lbs. is fine if you have a pressure gauge) and do the bleeding process. When you're done, release the pressure from the tank, allowing excess fluid to drain back to the tank by gravity, then release your quik connect and remove the cap.
Easy-Peasy.
The first time you use it, pressurize it to 2 - 5 lbs. and check for leaks. Have a few rags handy, just in case. See no leaks? Then run it up to 10 lbs. and re-check. Still no leaks? Go have a Molson and congratulate yourself.