While it may stick to certain tanks it's not recommended you trust your mobile device or GPS unit to it.
The RAM-B-224-1U consists of a 3.3" diameter suction cup twist lock base that is connected to the (RAM-B-238U), diamond base with B size 1" rubber ball.
The suction cup is designed to have an extra strong hold on any smooth non-porous surface, but for best result, mount the suction cup on a glass or non-porous plastic surface.
