There is always a brass connection on our semi-transparent plastic tanks. If you order this "drilled", it will be drilled out (opened) after production. The connection is so useable, and you can attach additional accessories like our Brass Tank Connection Sets to the internal thread of the brass connector/outlet. The liquid will get into contact with the brass connection.
If you order the tank with an "undrilled" connection the brass connection is also available on the tank, but not drilled out/through (so it will be closed). This means that the brass connection is completely covered with plastic from the inside and does not get into contact with the stored liquid. The connection is completely closed, and no extra plug is required for closing the connection. If necessary, you can drill the connection by yourself with a hole circle drill and use it normally.
