I want to connect up a second gas bottle. I have the space and the crash sensor (regulator?) will accept two. The unused side of the sensor has what looks like a blanking plug screwed on. I know that fitting a gas coupling to the bottle is bsck to front, i.e. turn anticlockwise to tighten but is this also true for the other end? The blanking plug is on tight and concerned about trying to unscrew it the wrong way and end up over tightening.