... of water Vitreous china sanitary ware Toilet - EPA WaterSense HET - High Efficiency Toilet (T/X-6688E) - Sanitary Ware660 x 386 x ... OPS - a professional manufacturer of ceramic sanitary ware including one piece toilet, two piece toilet, HET - high efficiency toilet, lavatory, sink, ... more than 10 years, and many of our vitreous china (ceramic) products are UPC & cUPC certified. Hope you can find ...