GoCode in-floor shower pans recess into the van floor so the shower disappears until you need it. Brushed magnetic stainless steel, so the Universal Shower Curtain seals with magnets and no track. The standard pan needs 1.3" of subfloor; the Slim only 3/4". Each has a center drain with a 1-1/2" threaded fitting. ProMaster needs a leveling kit for drainage. See complete shower setup.