Fresh water tank access hatch/plug

[Simon.mu]

Hi

MY 2008  bav38 has a water tank problem - both the water level gauge and the access hatch (5"diam) leak when the tank is 100% full

Need some help as to how to remove them- are they screw out, glued in place etc, as neither seem to want to move with hand pressure

[patprice]

Simon my Bav 42 is a 2000 model and maybe different tanks to yours. But mine leak also. The inspection covers, which unscrew, are missing an "O" ring which I will fit.