39 1/2" x 21 3/8" x 3 3/8" - SP500 shower pan. 39 1/2" x 21 3/8" x 6 1/2" - SP500A model is designed to fit certain Aliner Ascape ST models. It has a 13" by 4 1/2" corner section molded out as a recess. Shower pans are constructed of durable ABS plastic with reinforced bottoms for extra durability. Available in Polar White. The drain is molded into the pan and ready to be drilled. Drain is molded in, ready to be drilled Upgrade or replace your bath products in your RV or trailer with industry leading quality products from ICON | Icon Technologies Shower Pan, SP500A-PW, Assembly | ABS Plastic