Super Max Bailer - Inside MountFlange Size: - 78 x 135mm (3-1/8 x 5-5/16")The ANDERSEN automatic bailers are available world wide and recognized by dinghy sailors as the most effective and reliable means of automatic Bailers are made of Stainless Steel, guaranteeing you many years of trouble free :Effective and reliable means of automatic bailingMade of stainless steel and guaranteeing years of trouble free servicing