Drilling out screw holes in the tank. Tommi 26.1.2014, 20:49 Full size 1000 × 563 pixels Drilling out screw holes in the tank. Previous imageThe kidneys keep the valves from falling and the head from moving around. Next imageFitting the flange inside the tank. Threads were tapped to the flange. Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *CommentName* Email* Website Save my name, email, and site URL in my browser for next time I post a comment. Notify me of new posts by email.