I am installing a Sealand on a 2 hole flange. What should I do?
Line up the flange with the bottom of the pedestal, and mark 2 extra drill holes that line up with the floor bolts. If you do not want to do this, 4-hole flanges are available from Sun-Mar for a small charge. Buy the special Sealand floor flange with the Sealand for a small extra charge – it saves you the trouble of modifying a universal flange.