toilet tank covers

Some Poskim forbid removing the toilet tank cover on Shabbos,

being the tank is מחובר לקרקע (attached to the ground).*   

Mori V'rabi Hagaon Harav Shlomo Miller Shlita, argues and

holds, since the cover is designed to be removed easily, it is

considered as if it has a handle. A cover with a handle may

be removed from a בור  (pit) which is מחובר לקרקע.** 

The tank cover is considered a כלי (vessel) and not בטל to the

מחובר tank.Therefore there is no סותר or מוקצה.

             *סותר ומוקצה