Niagara N2216T Flapperless 1.6 GPF Toilet Tank, White Niagara flapperless toilet tank, 1.6 gph - 558673 This is highly durable This is manufactured in china Single Flush 1.6 GPF (6.06 LPF) Max Flush Rate Gravity fed Flush 1.6 GPF Patented Niagara Flapperless Flush System Flapperless system eliminates all refill noise