Rule shower drain box provides ultimate pumping performance, which helps keep your boat clear of nuisance water, building on the genuine Rule design. Rigorous engineering and testing helped generate the latest series of Rule automatic shower and sink drain systems. Our products are tested to the highest standard, providing better efficiency for the toughest applications. The Rule shower drain systems have been designed to meet the needs of installers and end users. As well as reliable, fully automatic operation, the new Rule shower box is simple to install, has a sealed clip-on lid to prevent unwanted water splash and is fully serviceable without the need for any tools.