These tanks have the same features as the flat bottom tanks with an added bonus – the bottom is cone-shaped for total drainage. These tanks must be supported with some types of stand. PT-301, 312 and 314 have a 15° cone. PT-300, 302 to 308 and 316 have a 45° cone. In stock, in black, available in gray, natural or blue. Price for lid and support on demand.